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National Cooperative Highway Research Program (NCHRP) Web-Only Documents

Web-only documents are fully searchable PDFs of contractor-prepared reports or supporting appendix materials. Web-only documents are linked to other related project products, as well as to the relevant project write-ups.

Below are all NCHRP Web-Only Documents that have been produced by TRB since April 2002.  To search for older publications visit the TRB Online Bookstore or the TRB Publication Index.


Survey of State Funding for Public Transportation—Ways to Improve ItSurvey of State Funding for Public Transportation—Ways to Improve It
April 26, 2012
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 188: Survey of State Funding for Public Transportation—Ways to Improve It includes suggestions on ways to potentially improve the Survey of State Funding for Public Transportation. Areas covered by the report include definition of major terms, post-submission data checks, improved accessibility, non-transit related fe...
Seismic Design of Geosynthetic-Reinforced Soil Bridge Abutments with Modular Block FacingSeismic Design of Geosynthetic-Reinforced Soil Bridge Abutments with Modular Block Facing
April 5, 2012
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 187: Seismic Design of Geosynthetic-Reinforced Soil Bridge Abutments with Modular Block Facing explores design methods and construction guidelines for using geosynthetic-reinforced soil (GRS) systems in bridge abutments in seismically active regions. The report focuses on single-span, simply-supported bridges subjecte...
The Superpave Mix Design System: Anatomy of a Research ProgramThe Superpave Mix Design System: Anatomy of a Research Program
March 24, 2012
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 186: The Superpave Mix Design System: Anatomy of a Research Program describes how the original Strategic Highway Research Program (SHRP) effort was conceived, funded, and managed. The report outlines the research and implementation efforts that brought SHRP products into routine use and summarizes some of the key less...
Going the Distance Together: A Citizen’s Guide to Context Sensitive Solutions for Better TransportationGoing the Distance Together: A Citizen’s Guide to Context Sensitive Solutions for Better Transportation
April 9, 2012
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 184: Going the Distance Together: A Citizen’s Guide to Context Sensitive Solutions for Better Transportation is designed to help people ask the right questions at the right time during the transportation planning process in order to help ensure that transportation projects fit the context of their community. Context s...
Appendices to NCHRP Report 693Appendices to NCHRP Report 693
February 20, 2012
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 182: Appendices to NCHRP Report 693 includes a set of tables showing systems operations and management job categories, number of positions, and educational requirements for all 50 states. NCHRP Report 693 : Attracting, Recruiting, and Retaining Skilled Staff for Transportation System Operations and Management provides...
Truck Tolling: Understanding Industry Tradeoffs When Using or Avoiding Toll FacilitiesTruck Tolling: Understanding Industry Tradeoffs When Using or Avoiding Toll Facilities
December 19, 2011
TRB’s National Cooperative Freight Research Program (NCFRP) and National Cooperative Highway Research Program (NCHRP) have jointly released NCFRP Web-Only Document 3/NCHRP Web-Only Document 185: Truck Tolling: Understanding Industry Tradeoffs When Using or Avoiding Toll Facilities. The report explores the value that shippers, trucking companies, and truck drivers seek from toll roads.
Evaluation of Bridge-Scour Research: Abutment and Contraction Scour Processes and PredictionEvaluation of Bridge-Scour Research: Abutment and Contraction Scour Processes and Prediction
October 27, 2011
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 181: Evaluation of Bridge-Scour Research: Abutment and Contraction Scour Processes and Prediction examines bridge-abutment scour and the effectiveness of the leading methods used for estimating design scour depth.
Producing Transportation Data Products from the American Community Survey That Comply With Disclosure RulesProducing Transportation Data Products from the American Community Survey That Comply With Disclosure Rules
September 23, 2011
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 180: Producing Transportation Data Products from the American Community Survey That Comply With Disclosure Rules explores approaches to apply data perturbation techniques that will provide Census Transportation Planning Products data users complete tables that are accurate enough to support transportation planning app...
Procedures for Verification and Validation of Computer Simulations Used for Roadside Safety ApplicationsProcedures for Verification and Validation of Computer Simulations Used for Roadside Safety Applications
October 5, 2011
TRB’s National Cooperative Highway Research Program (NCHRP) Web Only Document 179: Procedures for Verification and Validation of Computer Simulations Used for Roadside Safety Applications explores verification and validation procedures, quantifiable evaluation metrics, and acceptance criteria for roadside safety research that maximize the accuracy and utility of using finite element simulations.
Assessment of Auxiliary Through Lanes at Signalized IntersectionsAssessment of Auxiliary Through Lanes at Signalized Intersections
January 9, 2012
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 178: Assessment of Auxiliary Through Lanes at Signalized Intersections describes a project that investigated the operational, safety, and design characteristics of auxiliary through lanes (ATLs) at signalized intersections. The project resulted in the development of guidelines for the evaluation and application of ATL...
Evaluation of Bridge Scour Research: Geomorphic Processes and PredictionsEvaluation of Bridge Scour Research: Geomorphic Processes and Predictions
May 11, 2011
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 177: Evaluation of Bridge Scour Research: Geomorphic Processes and Predictions explores the impact of long-term aggradation and degradation, and lateral river channel migration, on highway structures.
Cost-Effective Connection Details for Highway Sign, Luminaire, and Traffic Signal StructuresCost-Effective Connection Details for Highway Sign, Luminaire, and Traffic Signal Structures
June 6, 2011
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 176: Cost-Effective Connection Details for Highway Sign, Luminaire, and Traffic Signal Structures presents the results of research that evaluated fatigue performance of several critical welded connections in the highway sign, signal, and high-level luminaire support structures.
Evaluation of Bridge Scour Research: Pier Scour Processes and PredictionsEvaluation of Bridge Scour Research: Pier Scour Processes and Predictions
May 6, 2011
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 175: Evaluation of Bridge Scour Research: Pier Scour Processes and Predictions explores the current state of knowledge regarding bridge-pier scour, assesses several methods for design estimates of scour depth, examines a structured methodology for scour-depth estimation for design purposes, and highlights aspects of&n...
Performance Measurement and Evaluation of Tolling and Congestion Pricing ProjectsPerformance Measurement and Evaluation of Tolling and Congestion Pricing Projects
January 31, 2012
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 174: Performance Measurement and Evaluation of Tolling and Congestion Pricing Projects provides an overview of the purpose, scope, and methodology, and a complete compilation of the work products that were used to develop NCHRP Report 694. NCHRP Report 694 : Evaluation and Performance Measurement of Congestion Pricing...
Cast-in-Place Concrete Connections for Precast Deck SystemsCast-in-Place Concrete Connections for Precast Deck Systems
March 9, 2011
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 173: Cast-in-Place Concrete Connections for Precast Deck Systems offers suggested design and construction guidance for and includes five illustrative examples of durable case-in-place reinforced concrete connections for precast deck systems that emulate monolithic construction, considering issues including speed of co...
Adapting Specification Criteria for Simple Performance Tests to HMA Mix DesignAdapting Specification Criteria for Simple Performance Tests to HMA Mix Design
March 1, 2011
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 172: Adapting Specification Criteria for Simple Performance Tests to HMA Mix Design describes the inputs and outputs of the excel based program for Integrated Analysis of HMA Mix And Structural Designs. The report also reviews the program’s underlying performance prediction models, and highlights examples that illustr...
Identification of Results-Oriented Public Involvement Strategies Between Transportation Agencies and Native American Tribal CommunitiesIdentification of Results-Oriented Public Involvement Strategies Between Transportation Agencies and Native American Tribal Communities
June 8, 2011
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 171: Identification of Results-Oriented Public Involvement Strategies Between Transportation Agencies and Native American Tribal Communities documents the project that led to development of NCHRP Report 690. NCHRP Report 690: A Guidebook for Successful Communication, Cooperation, and Coordination Strategies Between Tr...
Determining Guidelines for Ramp and Interchange SpacingDetermining Guidelines for Ramp and Interchange Spacing
April 7, 2011
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 169: Determining Guidelines for Ramp and Interchange Spacing documents the research effort related to the development of NCHRP Report 687: Guidelines for Ramp and Interchange Spacing.  NCHRP Report 687 explores guidelines for ramp and interchange spacing based on design, operations, safety, and signing considerat...
Precision Estimates of AASHTO T 180: Moisture-Density Relations of Soils Using a 4.54-kg (10-lb) Rammer and a 457-mm (18-in.) DropPrecision Estimates of AASHTO T 180: Moisture-Density Relations of Soils Using a 4.54-kg (10-lb) Rammer and a 457-mm (18-in.) Drop
December 20, 2010
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 168: Precision Estimates of AASHTO T 180: Moisture-Density Relations of Soils Using a 4.54-kg (10-lb) Rammer and a 457-mm (18-in.) Drop explores an interlaboratory study and data mining of the proficiency sample program to prepare precision estimates for American Association of State Highway and Transportation Officia...
Statistical Modeling of Cement Heat of Hydration Using Phase and Fineness VariablesStatistical Modeling of Cement Heat of Hydration Using Phase and Fineness Variables
November 20, 2010
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 167: Statistical Modeling of Cement Heat of Hydration Using Phase and Fineness Variables explores alternative predictive models for seven-day cement heat of hydration.
Precision Estimates of AASHTO T283: Resistance of Compacted Hot-Mix Asphalt (HMA) to Moisture-Induced DamagePrecision Estimates of AASHTO T283: Resistance of Compacted Hot-Mix Asphalt (HMA) to Moisture-Induced Damage
November 18, 2010
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 166: Precision Estimates of AASHTO T283: Resistance of Compacted Hot-Mix Asphalt (HMA) to Moisture-Induced Damage includes the results of an interlaboratory study to prepare a precision and bias statement for the American Association of State Highway and Transportation Officials (AASHTO) T283 test resistance of compac...
Precision Estimates of AASHTO T148: Measuring Length of Drilled Concrete CoresPrecision Estimates of AASHTO T148: Measuring Length of Drilled Concrete Cores
November 16, 2010
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 165: Precision Estimates of AASHTO T148: Measuring Length of Drilled Concrete Cores includes the results of a round robin study to prepare precision estimates for American Association of State Highway and Transportation Officials (AASHTO) T148 test method used for determining the length of a core drilled from a concre...
Precision Estimates of AASHTO T265: Laboratory Determination of Moisture Content of SoilsPrecision Estimates of AASHTO T265: Laboratory Determination of Moisture Content of Soils
November 13, 2010
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 164: Precision Estimates of AASHTO T265: Laboratory Determination of Moisture Content of Soils includes the results of an interlaboratory study to prepare precision estimates for the American Association of State Highway and Transportation Officials (AASHTO) T265 test method used for laboratory determination of moistu...
Precision Estimates of AASHTO T267: Determination of Organic Content in Soils by Loss on IgnitionPrecision Estimates of AASHTO T267: Determination of Organic Content in Soils by Loss on Ignition
November 11, 2010
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 163: Precision Estimates of AASHTO T267: Determination of Organic Content in Soils by Loss on Ignition includes the results of an interlaboratory study to prepare precision estimates for the American Association of State Highway and Transportation Officials T267 test method used for the determination of organic conten...
Top-Down Cracking of Hot-Mix Asphalt Layers: Models for Initiation and PropagationTop-Down Cracking of Hot-Mix Asphalt Layers: Models for Initiation and Propagation
September 8, 2010
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 162: Top-Down Cracking of Hot-Mix Asphalt Layers: Models for Initiation and Propagation explores mechanistic-based models for predicting top-down cracking in hot-mix asphalt layers for use in mechanistic-empirical procedures for design and analysis of new and rehabilitated flexible pavements.
System Trials to Demonstrate Mileage-Based Road Use ChargesSystem Trials to Demonstrate Mileage-Based Road Use Charges
December 10, 2010
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 161: System Trials to Demonstrate Mileage-Based Road Use Charges explores factors to be considered in designing and implementing large-scale trials of mechanisms for collecting road-user charges based on vehicle-miles of travel.
Supporting Material to NCHRP Report 674Supporting Material to NCHRP Report 674
January 24, 2011
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 160 includes appendices B through N to NCHRP Report 674 : Crossing Solutions at Roundabouts and Channelized Turn Lanes for Pedestrians with Vision Disabilities, which explores information related to establishing safe crossings at roundabouts and channelized turn lanes for pedestrians with vision disabilities. App...
Supporting Materials for NCHRP Report 673Supporting Materials for NCHRP Report 673
June 2, 2011
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 159: Supporting Materials for NCHRP Report 673 contains the final report on the project that developed  NCHRP Report 673: A Manual for Design of Hot Mix Asphalt with Commentary and Appendixes C through F to the report. NCHRP Report 673 contains a mix design manual for hot-mix asphalt (HMA) that incorporates ...
Field Test Results of the Multimodal Level of Service Analysis for Urban StreetsField Test Results of the Multimodal Level of Service Analysis for Urban Streets
June 7, 2010
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 158: Field Test Results of the Multimodal Level of Service Analysis for Urban Streets (MMLOS) explores the result of a field test of the MMLOS in 10 metropolitan areas in the United States. NCHRP Web-Only Document 158 represents the third and final phase of a project that included development of NCHRP Report 616 ...
Volume I: Evaluation of Existing Roadside Safety Hardware Using Updated Criteria—Technical ReportVolume I: Evaluation of Existing Roadside Safety Hardware Using Updated Criteria—Technical Report
August 30, 2010
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 157: Volume I: Evaluation of Existing Roadside Safety Hardware Using Updated Criteria—Technical Report explores the process that was followed in developing NCHRP Research Results Digest (RRD) 349: Evaluation of Existing Roadside Safety Hardware Using Manual for Assessing Safety Hardware (MASH) Criteria.  NCHRP RR...
Optical Sizing and Roundness Determination of Glass Beads Used in Traffic MarkingsOptical Sizing and Roundness Determination of Glass Beads Used in Traffic Markings
October 14, 2010
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 156: Optical Sizing and Roundness Determination of Glass Beads Used in Traffic Markings is the final report on a project that examined the precision and bias of both optical and traditional mechanical methods for different glass bead types. The project also compared the precision and bias of various measurement method...
Design Guidelines for Durability of Bonded CFRP Repair/Strengthening of Concrete BeamsDesign Guidelines for Durability of Bonded CFRP Repair/Strengthening of Concrete Beams
August 12, 2010
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 155: Design Guidelines for Durability of Bonded CFRP Repair/Strengthening of Concrete Beams explores a methodology for the evaluation of durability-related strength loss of bonded carbon fiber-reinforced polymer (CFRP) systems applied to concrete beams. The report also examines test methods to help establish a durabil...
Target-Setting Methods and Data Management to Support Performance-Based Resource Allocation by Transportation Agencies - Volume III: Case StudiesTarget-Setting Methods and Data Management to Support Performance-Based Resource Allocation by Transportation Agencies - Volume III: Case Studies
October 11, 2010
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 154: Target-Setting Methods and Data Management to Support Performance-Based Resource Allocation by Transportation Agencies - Volume III: Case Studies includes case studies of organizations investigated in the research used to develop NCHRP Report 666. NCHRP Report 666 : Target-Setting Methods and Data Management to S...
A National Database of Subgrade Soil-Water Characteristic Curves and Selected Soil Properties for Use with the MEPDGA National Database of Subgrade Soil-Water Characteristic Curves and Selected Soil Properties for Use with the MEPDG
September 2, 2010
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 153: A National Database of Subgrade Soil-Water Characteristic Curves and Selected Soil Properties for Use with the MEPDG is the contractor’s final report and Appendices A through D related to NCHRP Research Results Digest 347 with the same title.  NCHRP RRD 347 explores the creation of a national database o...
Assessing Mechanisms for Integrating Transportation-Related Greenhouse Gas Reduction Objectives into Transportation Decision MakingAssessing Mechanisms for Integrating Transportation-Related Greenhouse Gas Reduction Objectives into Transportation Decision Making
March 22, 2010
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 152: Assessing Mechanisms for Integrating Transportation-Related Greenhouse Gas Reduction Objectives into Transportation Decision Making examines alternative methods that state departments of transportation and metropolitan planning organizations may use to manage greenhouse gas emissions from transportation.
Geometric Design of DrivewaysGeometric Design of Driveways
August 5, 2010
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 151: Geometric Design of Driveways includes material related to and supporting contents of NCHRP Report 659: Guide for the Geometric Design of Driveways.  NCHRP Report 659 explores guidelines related to the geometric design of driveways. The report includes driveway-related terms and definitions, an examinat...
Accessible Pedestrian Signals: A Guide to Best Practices (Workshop Edition 2010)Accessible Pedestrian Signals: A Guide to Best Practices (Workshop Edition 2010)
January 18, 2011
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 150: Accessible Pedestrian Signals: A Guide to Best Practices (Workshop Edition 2010) provides an introduction to accessible pedestrian signals (APS) and highlights issues related to the design, installation, operation, and maintenance of APS. The report also addresses public education, U.S. case studies, and internat...
Recommended LRFD Minimum Flexural Reinforcement RequirementsRecommended LRFD Minimum Flexural Reinforcement Requirements
February 10, 2010
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 149: Recommended LRFD Minimum Flexural Reinforcement Requirements explores the minimum reinforcement requirements for the design of concrete bridge structures and examines flexural cracking of concrete structures.
Debris Photographic Archive and Supplemental Materials for NCHRP Report 653Debris Photographic Archive and Supplemental Materials for NCHRP Report 653
June 2, 2010
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 148: Debris Photographic Archive and Supplemental Materials for NCHRP Report 653 includes the debris photographic archive, the survey questionnaire and list of respondents, and the report on the field pilot study related to development of NCHRP 653. NCHRP Report 653 : Effects of Debris on Bridge Pier Scour explores gu...
Reference Materials for State DOT Title VI Compliance: Appendices to NCHRP Research Results Digest 340Reference Materials for State DOT Title VI Compliance: Appendices to NCHRP Research Results Digest 340
January 12, 2010
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 147: Reference Materials for State DOT Title VI Compliance: Appendices to NCHRP Research Results Digest 340 includes a collection of material related to best practices that were used to help develop NCHRP Research Results Digest 340: State DOT Best Practices for Title VI Compliance .
Replacement Processes for Light Emitting Diode (LED) Traffic SignalsReplacement Processes for Light Emitting Diode (LED) Traffic Signals
September 30, 2009
TRB's National Cooperative Highway Research Program (NCHRP) Web-Only Document 146: Replacement Processes for Light Emitting Diode (LED) Traffic Signals explores the photometric requirements, measurement, and maintenance of traffic signal modules using light emitting diodes (LEDs). _______________________ NCHRP Web-Only Document 146 contains an incomplete Acknowledgments section. The complete Ac...
Recommended Practice for Stabilization of Sulfate-Rich Subgrade SoilsRecommended Practice for Stabilization of Sulfate-Rich Subgrade Soils
October 15, 2009
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 145: Recommended Practice for Stabilization of Sulfate-Rich Subgrade Soils examines the nature of minerals ettringite and thaumasite, and explores the mechanism of their formation in soils stabilized with lime, cement, or fly ash.
Recommended Practice for Stabilization of Subgrade Soils and Base MaterialsRecommended Practice for Stabilization of Subgrade Soils and Base Materials
October 13, 2009
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 144: Recommended Practice for Stabilization of Subgrade Soils and Base Materials explores a methodology to determine which stabilizers should be considered as candidates for stabilization for a specific soil, pavement, and environment.
Implementable Strategies for Shifting to Direct Usage-Based Charges for Transportation FundingImplementable Strategies for Shifting to Direct Usage-Based Charges for Transportation Funding
September 9, 2009
TRB's National Cooperative Highway Research Program (NCHRP) Web-Only Document 143: Implementable Strategies for Shifting to Direct Usage-Based Charges for Transportation Funding explores ways that direct charges to road users, based on vehicle-miles of travel (VMT), could be implemented within approximately the next 5 years.
Precision Estimates of AASHTO T 242Precision Estimates of AASHTO T 242
September 15, 2009
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 142: Precision Estimates of AASHTO T 242 examines precision estimates for AASHTO (American Association of State Highway and Transportation Officials) T 242, “Frictional Properties of Paved Surfaces Using a Full-Scale Tire.”
Precision Estimates for AASHTO Test Method T 104, Determined Using AMRL Proficiency Sample DataPrecision Estimates for AASHTO Test Method T 104, Determined Using AMRL Proficiency Sample Data
September 3, 2009
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 141: Precision Estimates for AASHTO Test Method T 104, Determined Using AMRL Proficiency Sample Data explores the use of data from the AASHTO Materials Reference Laboratory (AMRL) Proficiency Sample Program (PSP) used to update precision estimates for American Association of State Highway and Transportation Officials ...
Precision Estimates for AASHTO Test Methods T 186, T 154, and T 22, Determined Using CCRL Proficiency Sample DataPrecision Estimates for AASHTO Test Methods T 186, T 154, and T 22, Determined Using CCRL Proficiency Sample Data
August 24, 2009
TRB’s National Cooperative Highway Research Program (NCHRP) has released Web-Only Document 140: Precision Estimates for AASHTO Test Methods T 186, T 154, and T 22, Determined Using CCRL Proficiency Sample Data. Web-Only Document 140 explores the precision estimates for American Association of State Highway and Transportation Officials’ Standard Test Method T 186 “Early Stiffening of Hydraulic C...
Precision Estimates for AASHTO Test Method T 105, Determined Using CCRL Proficiency Sample DataPrecision Estimates for AASHTO Test Method T 105, Determined Using CCRL Proficiency Sample Data
August 26, 2009
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 139: Precision Estimates for AASHTO Test Method T 105, Determined Using CCRL Proficiency Sample Data explores the use of data from the Cement and Concrete Reference Laboratory (CCRL) Proficiency Sample Program (PSP) that was collected from state laboratories to update precision estimates for American Association of St...
Annotated Literature Review for NCHRP Report 640Annotated Literature Review for NCHRP Report 640
October 16, 2009
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 138: Annotated Literature Review for NCHRP Report 640 includes summaries of various items that were found in the literature review associated with the production of NCHRP Report 640 : Performance and Maintenance of Permeable Friction Courses. 
Guidance for Transportation Project ManagementGuidance for Transportation Project Management
June 11, 2009
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 137: Guidance for Transportation Project Management explores tools designed to potentially enhance an agencies’ transportation project management process and examines innovative way to manage a project.
Performance Measures for Snow and Ice Control Operations: Supplemental MaterialPerformance Measures for Snow and Ice Control Operations: Supplemental Material
April 13, 2009
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 136: Performance Measures for Snow and Ice Control Operations highlights information on the current practices regarding the methods and measures used for assessing agency and contractor performance in snow and ice control operations.  Additional information on the project was published as NCHRP Research Results ...
Protocols for Collecting and Using Traffic Data in Bridge DesignProtocols for Collecting and Using Traffic Data in Bridge Design
March 26, 2009
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 135: Protocols for Collecting and Using Traffic Data in Bridge Design explores a set of protocols and methodologies for using available recent truck traffic data to develop and calibrate live load models for load and resistance design factor bridge design. This report has been superseded by NCHRP Report 683: Protocol...
An Experimental Plan for Validation of an Endurance Limit for HMA PavementsAn Experimental Plan for Validation of an Endurance Limit for HMA Pavements
March 5, 2009
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 134: An Experimental Plan for Validation of an Endurance Limit for HMA Pavements explores a research plan and associated cost estimate for a future study to validate the endurance limit for hot-mix asphalt (HMA) and to improve mechanistic-empirical pavement design.
Supporting Materials for NCHRP Report 626 Supporting Materials for NCHRP Report 626
June 2, 2009
TRB's National Cooperative Highway Research Program (NCHRP) Web-Only Document 133 documents the research associated with the production of NCHRP Report 626 : NDT Technology for Quality Assurance of HMA Pavement Construction, which explores the application of nondestructive testing (NDT) technologies in the quality assurance of hot-mix asphalt (HMA) pavement construction.
Right-of-Way Methods and Tools to Control Project Cost EscalationRight-of-Way Methods and Tools to Control Project Cost Escalation
October 2, 2009
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 132: Right-of-Way Methods and Tools to Control Project Cost Escalation explores the data-gathering and analysis processes used to create a procedures guide for right-of-way cost estimating.
Communicating the Value of Research: Contractor's Final Report
June 24, 2009
TRB’s NationalCooperative  Highway Research Program (NCHRP) Web-Only Document 131: Communicating the Value of Transportation Research is the contractor’s final report on the research associated with NCHRP Report 610: Communicating the Value of Transportation Research .
A Guide to Emergency Quarantine and Isolation Controls of Roads in Rural AreasA Guide to Emergency Quarantine and Isolation Controls of Roads in Rural Areas
October 13, 2008
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 130 is an annotated bibliography that reviews several state emergency response plans associated with traffic control of rural roads in an agricultural emergency.  The material contained in Web-Only Document 130 was used to help produce NCHRP Report 525, Vol. 13: A Guide to Traffic Control of Rural Roads in an Ag...
Pedestrian Safety Prediction MethodologyPedestrian Safety Prediction Methodology
July 25, 2008
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 129, Phase 3: Pedestrian Safety Prediction Methodology explores development of improved pedestrian safety prediction models for use in the Highway Safety Manual.
Methodology to Predict the Safety Performance of Urban and Suburban ArterialsMethodology to Predict the Safety Performance of Urban and Suburban Arterials
July 18, 2008
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 129, Phases I and II: Methodology to Predict the Safety Performance of Urban and Suburban Arterials explore the development of a draft Highway Safety Manual chapter that explore a safety prediction methodology for urban and suburban arterials.
Multimodal Level of Service Analysis for Urban Streets: Users GuideMultimodal Level of Service Analysis for Urban Streets: Users Guide
September 15, 2008
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 128, Multimodal Level of Service Analysis for Urban Streets: Users Guide explores a set of procedures for predicting traveler perceptions of quality of service and performance measures for urban streets.  Quality of service and performance are considered in terms of the needs of auto drivers, bus passenger...
Performance Measurement Tool Box and Reporting System for Research Programs and ProjectsPerformance Measurement Tool Box and Reporting System for Research Programs and Projects
June 5, 2008
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 127: Performance Measurement Tool Box and Reporting System for Research Programs and Projects explores the integration of standard performance measures and tools to assist users in implementing performance measures into the Research Performance Measurement (RPM) System.
Methodology to Predict the Safety Performance of Rural Multilane HighwaysMethodology to Predict the Safety Performance of Rural Multilane Highways
May 29, 2008
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 126: Methodology to Predict the Safety Performance of Rural Multilane Highways explores a methodology designed to predict the safety performance of various elements considered in the planning, design, and operation of nonlimited-access rural multilane highways.
Color Effectiveness of Yellow Pavement Marking Materials: Full ReportColor Effectiveness of Yellow Pavement Marking Materials: Full Report
June 2, 2008
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 125: Color Effectiveness of Yellow Pavement Marking Materials explores the range of chromaticity coordinates that observers classify as yellow and white under daytime and incandescent illumination.  A summary of the report described in Web-Only Document 125 was produced as NCHRP Research Results Digest 328.
Guidelines for Selection of Speed Reduction Treatments at High-Speed Intersections: Supplement to NCHRP Report 613Guidelines for Selection of Speed Reduction Treatments at High-Speed Intersections: Supplement to NCHRP Report 613
July 24, 2008
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 124: Guidelines for Selection of Speed Reduction Treatments at High-Speed Intersections documents the research efforts associated with production of NCHRP Report 613 that explores the effectiveness of geometric design features as well as signage and pavement markings to reduce vehicle speeds at high-speed inter...
Evaluation of the Flashing Yellow Arrow Permissive-Only Left-Turn Indication Field ImplementationEvaluation of the Flashing Yellow Arrow Permissive-Only Left-Turn Indication Field Implementation
March 27, 2008
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 123: Evaluation of the Flashing Yellow Arrow Permissive-Only Left-Turn Indication Field Implementation explores the crash experiences associated with the use of the flashing yellow arrow (FYA) permissive only left-turn indication.
Development of a Comprehensive Modal Emissions ModelDevelopment of a Comprehensive Modal Emissions Model
May 6, 2008
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 122 explores development of a modal emissions model that reflects light-duty vehicle emissions produced as a function of the vehicle’s operating mode.
Assessing and Mitigating Future Impacts to the Federal Highway Trust Fund Such as Alternative Fuel ConsumptionAssessing and Mitigating Future Impacts to the Federal Highway Trust Fund Such as Alternative Fuel Consumption
March 21, 2008
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 121: Assessing and Mitigating Future Impacts to the Federal Highway Trust Fund Such as Alternative Fuel Consumption explores the impact of different scenarios on fuel consumption and fuel tax revenues.
A Survey of State Practices for Protecting Transportation Agencies Against Construction and Disadvantaged Business Enterprise Fraud Including Use of Contractor Suspension and Debarment ProceduresA Survey of State Practices for Protecting Transportation Agencies Against Construction and Disadvantaged Business Enterprise Fraud Including Use of Contractor Suspension and Debarment Procedures
December 21, 2007
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 120: A Survey of State Practices for Protecting Transportation Agencies Against Construction and Disadvantaged Business Enterprise Fraud Including Use of Contractor Suspension and Debarment Procedures explors state department of transportation practices involving the areas of highway construction contracting, includi...
Appendixes to NCHRP Report 598: Performance-Related Tests of Recycled Aggregates for Use in Unbound Pavement LayersAppendixes to NCHRP Report 598: Performance-Related Tests of Recycled Aggregates for Use in Unbound Pavement Layers
April 16, 2008
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 119 contains appendixes A through C of NCHRP Report 598: Performance-Related Tests of Recycled Aggregates for Use in Unbound Pavement Layers .  The appendixes cover the literature review and background information, new aggregate tests, and surface dielectric measurements associated with NCHRP Report 598.
Incorporating ITS Into the Transportation Planning Process: An Integrated Planning Framework (ITS, M&O, Infrastructure) Practitioner's GuidebookIncorporating ITS Into the Transportation Planning Process: An Integrated Planning Framework (ITS, M&O, Infrastructure) Practitioner's Guidebook
February 21, 2008
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 118, Part II: Incorporating ITS Into the Transportation Planning Process: An Integrated Planning Framework (ITS, M&O, Infrastructure) Practitioner’s Guidebook explores factors that are pushing regions and states towards integration of intelligent transportation systems in the transportation planning p...
Incorporating ITS Into the Transportation Planning Process: An Integrated Planning Framework (ITS, M&O, Infrastructure) Executive GuidebookIncorporating ITS Into the Transportation Planning Process: An Integrated Planning Framework (ITS, M&O, Infrastructure) Executive Guidebook
February 21, 2008
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 118, Part I: Incorporating ITS Into the Transportation Planning Process: An Integrated Planning Framework (ITS, M&O, Infrastructure) Executive Guidebook explores factors that are pushing regions and states towards integration of intelligent transportation systems in the transportation planning process, incl...
Guidelines for Accessible Pedestrian Signals: Final ReportGuidelines for Accessible Pedestrian Signals: Final Report
June 4, 2008
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 117B: Guidelines for Accessible Pedestrian Signals (Final Report) provides details on research used to develop a one-day training course on accessible pedestrian signals (APS) and to produce an APS intersection prioritization tool.  For additional information on the training program, contact S.A. Parker of...
Accessible Pedestrian Signals: A Guide to Best PracticeAccessible Pedestrian Signals: A Guide to Best Practice
June 4, 2008
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 117A: Accessible Pedestrian Signals: A Guide to Best Practice is designed to serve as a companion resource document to a one-day training course on accessible pedestrian signals.  For information on the training program, contact S.A. Parker of TRB at SAParker@nas.edu. An appendix to Web-Only Document 117A includ...
Corrosion Study and Implementation Plan for NCHRP Report 597Corrosion Study and Implementation Plan for NCHRP Report 597
April 24, 2008
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 116 includes the corrosion study and implementation plan for NCHRP Report 597: Development of a Recommended Practice for Use of Controlled Low-Strength Material in Highway Construction.  NCHRP Report 597 explores the use of controlled low-strength material (CLSM) in highway construction applications, in pa...
Using the Results of Contractor-Performed Tests in Quality Assurance: Contractor's Final ReportUsing the Results of Contractor-Performed Tests in Quality Assurance: Contractor's Final Report
December 17, 2007
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 115: Using the Results of Contractor-Performed Tests in Quality Assurance includes select chapters of the contractor’s final report on this project, which explores whether state departments of transportation can effectively use contractor-performed test results in the quality-assurance process.  NCHR...
Precision Estimates for AASHTO Test Method T 269 Determined Using AMRL Proficiency Sample DataPrecision Estimates for AASHTO Test Method T 269 Determined Using AMRL Proficiency Sample Data
August 22, 2007
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 114: Precision Estimates for AASHTO Test Method T 269 Determined Using AASHTO Materials Reference Laboratory (AMRL) Proficiency Sample Data explores the use of data from the AMRL Proficiency Sample Program (PSP) to update precision estimates for the American Association of State Highway and Transportation Offic...
Environmental Effects in Pavement Mix and Structural Design SystemsEnvironmental Effects in Pavement Mix and Structural Design Systems
October 1, 2007
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 113: Environmental Effects in Pavement Mix and Structural Design Systems examines limitations associated with provisional protocols on hardening potential of asphalt binders and mixes, and explores ways to enhance the predictive capabilities of these protocols.  A summary of this effort was published as NC...
Integrating Freight into Transportation Planning and Project-Selection ProcessesIntegrating Freight into Transportation Planning and Project-Selection Processes
December 13, 2007
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 112: Integrating Freight into Transportation Planning and Project-Selection Processes documents the approach and findings resulting from a project that explored techniques designed to help states and MPOs more fully incorporate freight throughout the entire transportation planning and programming process and mo...
Technical Reports for Recommended Performance-Related Specification for Hot-Mix Asphalt Construction: Results of the WesTrack ProjectTechnical Reports for Recommended Performance-Related Specification for Hot-Mix Asphalt Construction: Results of the WesTrack Project
September 21, 2007
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 111: Recommended Performance-Related Specification for Hot-Mix Asphalt Construction: Results of the WesTrack Project includes the contractor’s technical reports used for development of NCHRP Report 455, Recommended Performance-Related Specification for Hot-Mix Asphalt Construction: Results of the WesTrack...
Supplementary Cementitious Materials to Enhance Durability of Concrete Bridge Decks
September 14, 2007
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 110: Supplementary Cementitious Materials to Enhance Durability of Concrete Bridge Decks includes background information and a hypothetical case study used to help develop NCHRP Report 566.   The Statistical Experimental Design for Optimizing Concrete ( SEDOC ) , the computational tool for the concrete mixture o...
Precision Estimates of Selected Volumetric Properties of HMA Using Absorptive AggregatePrecision Estimates of Selected Volumetric Properties of HMA Using Absorptive Aggregate
July 16, 2007
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 109: Precision Estimates of Selected Volumetric Properties of HMA Using Absorptive Aggregate explores precision estimates for the American Association of State Highway and Transportation Officials and ASTM standards used to determine selected volumetric properties of hot-mix asphalt (HMA) using absorptive aggre...
Guide for Pavement FrictionGuide for Pavement Friction
June 5, 2009
TRB's National Cooperative Highway Research Program (NCHRP) Web-Only Document 108: Guide for Pavement Friction examines the management of pavement friction on existing highways and explores the design of new highway surfaces with adequate pavement friction.  The report also highlights the importance of pavement friction in highway safety; factors affecting pavement friction; and the equip...
Risk-Based Management Guidelines for Scour at Bridges with Unknown FoundationsRisk-Based Management Guidelines for Scour at Bridges with Unknown Foundations
August 15, 2007
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 107: Risk-Based Management Guidelines for Scour at Bridges with Unknown Foundations examines a risk-based approach to managing bridges in the absence of foundation information.  A risk assessment tool and instructions are available online.
Criteria for Selecting Hydraulic ModelsCriteria for Selecting Hydraulic Models
September 26, 2007
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 106: Criteria for Selecting Hydraulic Models explores develop a decision tool for selecting either a one- or a two-dimensional hydraulic model when examining flow through bridge crossings.  The decision tool is designed to provide a procedure for selecting the most appropriate model for a particular applic...
Final Report for NCHRP Report 581: Design of Construction Work Zones on High-Speed HighwaysFinal Report for NCHRP Report 581: Design of Construction Work Zones on High-Speed Highways
May 16, 2007
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 105 is the contractor’s final report on the research activities used to develop NCHRP Report 581: Design of Construction Work Zones on High-Speed Highways.  NCHRP Report 581 explores an approach for the selection of an appropriate construction work zone type; offers suggested guidance for the design ...
Final Report for NCHRP RRD 316: Using Surface Energy Measurements to Select Materials for Asphalt PavementFinal Report for NCHRP RRD 316: Using Surface Energy Measurements to Select Materials for Asphalt Pavement
May 10, 2007
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 104 is the final report of an investigation of the effectiveness and practicality of surface energy measurement as a tool for routine screening and selection of materials for optimum performance of hot-mix asphalt pavements.  A summary of the report was published as NCHRP Research Results Digest 316 .
Final Report for NCHRP Research Results Digest 317: Prototype Software for an Environmental Information Management and Decision Support SystemFinal Report for NCHRP Research Results Digest 317: Prototype Software for an Environmental Information Management and Decision Support System
April 25, 2007
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 103 is the final report and user’s guide for a prototype environmental information management software developed to help support environmental management for transportation and planning agencies.  Descriptions of the efforts to design, test, and demonstrate a prototype software were published as NCHRP Research R...
Future Financing Options to Meet Highway and Transit NeedsFuture Financing Options to Meet Highway and Transit Needs
February 13, 2007
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 102: Future Financing Options to Meet Highway and Transit Needs explores the viability of a range of conventional and innovative options for financing investments and operations of highway and transit systems.
Procedures for Evaluating Air-Entraining Admixtures for Highway ConcreteProcedures for Evaluating Air-Entraining Admixtures for Highway Concrete
July 30, 2007
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 101: Procedures for Evaluating Air-Entraining Admixtures for Highway Concrete contains the appendixes for NCHRP Report 578: Evaluating Air-Entraining Admixtures for Highway Concrete.
Examples of Best Practices for Communicating the Economic Benefits of TransportationExamples of Best Practices for Communicating the Economic Benefits of Transportation
October 10, 2007
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 100: Examples of Best Practices for Communicating the Economic Benefits of Transportation explores strategies and techniques that have been employed in the field to effectively communicate transportation’s importance to the economy.  The report also examines the circumstances under which the strategi...
Appendixes to NCHRP Research Results Digest 314: State DOT Staff Resources for Administering Federal Public Transportation ProgramsAppendixes to NCHRP Research Results Digest 314: State DOT Staff Resources for Administering Federal Public Transportation Programs
May 3, 2007
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 99 contains the appendixes to NCHRP Research Results Digest (RRD) 314 : State DOT Staff Resources for Administering Federal Public Transportation Programs.  NCHRP RRD 314 examines the staff resources that state departments of transportation (DOTs) devote to public transportation programs and explores the a...
Final Report for NCHRP Report 574: Guidance for Cost Estimation and Management for Highway Projects During Planning, Programming, and Preconstruction
February 26, 2007
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 98, Final Report for NCHRP Report 574: Guidance for Cost Estimation and Management for Highway Projects during Planning, Programming, and Preconstruction details the steps followed by the research team in the development of NCHRP Report 574: Guidance for Cost Estimation and Management for Highway Projects during Plan...
Guide to Effective Freeway Performance Measurement: Final Report and GuidebookGuide to Effective Freeway Performance Measurement: Final Report and Guidebook
March 19, 2007
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 97: Guide to Effective Freeway Performance Measurement: Final Report and Guidebook examines the effective use of freeway performance measures in operating a freeway system and in meeting the information needs of a large spectrum of potential local, regional, and national users.  The report includes detaile...
Appendixes to NCHRP Report 573: Superpave Mix Design: Verifying Gyration Levels in the Ndesign TableAppendixes to NCHRP Report 573: Superpave Mix Design: Verifying Gyration Levels in the Ndesign Table
April 23, 2007
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 96 contains the appendixes to NCHRP Report 573: Superpave Mix Design: Verifying Gyration Levels in the Ndesign Table .  The appendixes include the literature review, field project data, and roadway condition surveys associated with development of NCHRP Report 573.
Integrating Geospatial Technologies into the Right-of-Way Data-Management Process: Appendixes A through FIntegrating Geospatial Technologies into the Right-of-Way Data-Management Process: Appendixes A through F
February 16, 2007
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 95, Integrating Geospatial Technologies into the Right-of-Way Data-Management Process: Appendixes A through F, contains the appendices for NCHRP Research Results Digest 310: Integrating Geospatial Technologies into the Right-of-Way Data-Management Process.
Appendixes to NCHRP Report 572: Roundabouts in the United StatesAppendixes to NCHRP Report 572: Roundabouts in the United States
April 5, 2007
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 94, Appendixes to NCHRP Report 572: Roundabouts in the United States includes detailed reviews of the literature on safety performance and operational models, the master inventory of U.S. roundabouts assembled for this project, and the results of the statistical testing of various models associated with the pro...
Technical Appendix to NCHRP Report 571: Standardized Procedures for Personal Travel SurveysTechnical Appendix to NCHRP Report 571: Standardized Procedures for Personal Travel Surveys
May 13, 2008
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 93 is the technical appendix to NCHRP Report 571: Standardized Procedures for Personal Travel Surveys , which explores the aspects of personal travel surveys that could be standardized with the goal of improving the quality, consistency, and accuracy of the resulting data.
Pavement Marking Materials and Markers: Real-World Relationship Between Retroreflectivity and Safety Over TimePavement Marking Materials and Markers: Real-World Relationship Between Retroreflectivity and Safety Over Time
July 10, 2006
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 92, Pavement Marking Materials and Markers: Real-World Relationship Between Retroreflectivity and Safety Over Time examines the safety effect of retroreflectivity of longitudinal pavement markings and markers over time on non-intersection locations during non-daylight conditions. A summry of this report is avai...
Safety Impacts and Other Implications of Raised Speed Limits on High-Speed RoadsSafety Impacts and Other Implications of Raised Speed Limits on High-Speed Roads
March 29, 2006
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 90: Safety Impacts and Other Implications of Raised Speed Limits on High-Speed Roads examines how safety, economic, environmental, and commercial conditions on high-speed roadway may be impacted by a change in the speed limit.  Safety-related analyses included in the report were based on a comprehensive framewor...
Identification of Liability-Related Impediments to Sharing §409 Safety Data among Transportation Agencies and a Synthesis of Best Practices: Appendixes B through EIdentification of Liability-Related Impediments to Sharing §409 Safety Data among Transportation Agencies and a Synthesis of Best Practices: Appendixes B through E
November 21, 2006
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 89 contains the appendixes for NCHRP Research Results Digest (RRD) 306: Identification of Liability-Related Impediments to Sharing §409 Safety Data among Transportation Agencies and a Synthesis of Best Practices .  RRD 306 examines liability risks associated with sharing safety data among transportati...
Service Life of Corrosion-Damaged Reinforced Concrete Bridge Superstructure Elements: Web-Only DocumentService Life of Corrosion-Damaged Reinforced Concrete Bridge Superstructure Elements: Web-Only Document
November 2, 2006
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 88: Service Life of Corrosion-Damaged Reinforced Concrete Bridge Superstructure Elements documents the data utilized in the development and validation of the service life model presented in NCHRP Report 558: Manual on Service Life of Corrosion-Damaged Reinforced Concrete Bridge Superstructure Elements.   N...
Test Methods for Evaluating Field Performance of RWIS SensorsTest Methods for Evaluating Field Performance of RWIS Sensors
June 14, 2006
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 87: Test Methods for Evaluating Field Performance of Road Weather Information System (RWIS) Sensors explores field testing of environmental sensor stations (ESS) sensors in order to evaluate if a sensor is providing an accurate representation of actual conditions at the installed site.  The procedures cont...
Estimating the Impacts of the Aging Population on Transit RidershipEstimating the Impacts of the Aging Population on Transit Ridership
March 15, 2006
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 86: Estimating the Impacts of the Aging Population on Transit Ridership outlines the key demographic factors that affect public transportation use, with a particular focus on how the aging demographics of the country will impact future transit ridership. In addition, the report describes a spreadsheet tool that...
Considerations for a Guide to Contracting ITS ProjectsConsiderations for a Guide to Contracting ITS Projects
April 26, 2006
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 85: Considerations for a Guide to Contracting ITS Projects describes activities and highlights interim results associated with the research that was conducted as part of development of NCHRP Report 560: Guide to Contracting ITS Projects .  Web-Only Document 85 is designed to help other researchers and profession...
Innovative Load Testing SystemsInnovative Load Testing Systems
June 5, 2006
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 84: Innovative Load Testing Systems explores innovative load testing methods for deep foundations and interim procedures for their use and interpretation.  The report also examines additional research, testing, and analysis needed to provide guidelines for use of innovative load testing methods.
Scour at Contracted BridgesScour at Contracted Bridges
March 29, 2006
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 83: Scour at Contracted Bridges describes and quantifies the influence of processes affecting scour magnitude in contracted openings and examines physical- and numerical-model studies.  The report also includes interim guidance for applying scour-prediction methodology at contracted bridge sites for a wide...
Validation of Performance-Related Test of Aggregates for Use in Hot-Mix Asphalt Pavements: Appendixes A through FValidation of Performance-Related Test of Aggregates for Use in Hot-Mix Asphalt Pavements: Appendixes A through F
November 8, 2006
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 82: Validation of Performance-Related Test of Aggregates for Use in Hot-Mix Asphalt Pavements contains the appendixces to NCHRP Report 557: Aggregate Tests for Hot-Mix Asphalt Mixtures Used in Pavements .  NCHRP 557 examines performance-based procedures to test aggregates for use in pavements utilizing hot...
Design and Construction Guidelines for Geosynthetic-Reinforced Soil Bridge Abutments with a Flexible Facing: Appendix C--Verification of the Analytical ModelDesign and Construction Guidelines for Geosynthetic-Reinforced Soil Bridge Abutments with a Flexible Facing: Appendix C--Verification of the Analytical Model
April 20, 2006
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 81 is Appendix C—Verification of the Analytical Model to NCHRP Report 556: Design and Construction Guidelines for Geosynthetic-Reinforced Soil Bridge Abutments with a Flexible Facing.
Appendixes to NCHRP Report 555: Test Methods for Characterizing Aggregate Shape, Texture, and AngularityAppendixes to NCHRP Report 555: Test Methods for Characterizing Aggregate Shape, Texture, and Angularity
June 28, 2007
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 80, Appendixes to NCHRP Report 555: Test Methods for Characterizing Aggregate Shape, Texture, and Angularity contains appendixes B trough E of NCHRP Report 555.
Monitoring, Analyzing, and Reporting on the Environmental Streamlining Pilot ProjectsMonitoring, Analyzing, and Reporting on the Environmental Streamlining Pilot Projects
December 14, 2005
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 79: Monitoring, Analyzing, and Reporting on the Environmental Streamlining Pilot Projects seeks to identify ways to improve efficiency and reduce the time frame of the project development process while ensuring environmental protection, and to judge their applicability beyond the Pilot Project settings. The report in...
Simplified Shear Design of Structural Concrete Members: AppendixesSimplified Shear Design of Structural Concrete Members: Appendixes
January 31, 2006
TRB's National Cooperative Highway Research Program (NCHRP) Web-Only Document 78 contains the appendixes to NCHRP Report 549: Simplified Shear Design of Structural Concrete Members .
Consideration of Environmental Factors in Transportation Systems Planning: AppendixesConsideration of Environmental Factors in Transportation Systems Planning: Appendixes
December 15, 2005
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 77: Consideration of Environmental Factors in Transportation Skills Planning consists of the appendixes to NCHRP Report 541 of the same name, which examines procedures and methods for integrating environmental factors in transportation systems planning and decision making at the statewide, regional, and metropolitan ...
Final Report for Early-Opening-to-Traffic Portland Cement Concrete for Pavement RehabilitationFinal Report for Early-Opening-to-Traffic Portland Cement Concrete for Pavement Rehabilitation
August 11, 2005
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 76: Final Report for Early-Opening-to-Traffic Portland Cement Concrete for Pavement Rehabilitation contains the background information, experimental design, results, analysis, and conclusions of the study conducted under NCHRP Project 18-04B , “Durability of ‘Early-Opening-to-Traffic’ Portland Cement Concrete for Pav...
Use of Event Data Recorder (EDR) Technology for Highway Crash Data AnalysisUse of Event Data Recorder (EDR) Technology for Highway Crash Data Analysis
June 24, 2005
TRB’s National Cooperative Highway Research Program (NCHRP) Web Only Document 75: Use of Event Data Recorder (EDR) Technology for Highway Crash Data Analysis examines the legal issues surrounding EDRs and the consumer acceptability of EDR data collection.
LTPP Data Analysis: Influence of Design and Construction Features on the Response and Performance of New Flexible and Rigid PavementsLTPP Data Analysis: Influence of Design and Construction Features on the Response and Performance of New Flexible and Rigid Pavements
June 16, 2005
TRB’s National Cooperative Highway Research Program (NCHRP) Web Document 74: LTPP Data Analysis: Influence of Design and Construction Features on the Response and Performance of New Flexible and Rigid Pavements examines the relative influence of design and construction features on the response and performance of new flexible and rigid pavements.  According to the report, base type seems t...
Emergency Transportation Operations: Resources Guide for NCHRP Report 525, Volume 6Emergency Transportation Operations: Resources Guide for NCHRP Report 525, Volume 6
September 7, 2005
TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 73: Emergency Transportation Operations: Resources Guide for NCHRP Report 525, Volume 6 is a resources guide on emergency transportation operations (ETO) containing bibliographical material that may be useful to readers of NCHRP Report 525, Volume 6. NCHRP Report 525: Surface Transportation Security, Volume 6: Guide ...
National Calibration Facility for Retroreflective Traffic Control MaterialsNational Calibration Facility for Retroreflective Traffic Control Materials
June 30, 2005
TRB’s National Cooperative Highway Research Program (NCHRP) Web Only Document 72: National Calibration Facility for Retroreflective Traffic Control Materials is the full report of NCHRP Project 05-16, which developed dedicated reference instrumentation to provide national calibration standards for retroreflectivity, thereby improving the accuracy of measurements made by other instruments. A su...
Precision Estimates for AASHTO Test Method T308 and the Test Methods for Performance-Graded Asphalt Binder in AASHTO Specification M320Precision Estimates for AASHTO Test Method T308 and the Test Methods for Performance-Graded Asphalt Binder in AASHTO Specification M320
March 15, 2005
TRB’s National Cooperative Highway Research Program (NCHRP) Web Document 71:  Precision Estimates for AASHTO Test Method T308 and the Test Methods for Performance-Graded Asphalt Binder in AASHTO Specification M320 includes the results of Phase 3 of NCHRP 9-26, in which data from the AMRL Proficiency Sample Program (PSP) are used to create or update precision estimates for a variety of tes...
Comprehensive Human Factors Guidelines for Road Systems (Web-Only Document)Comprehensive Human Factors Guidelines for Road Systems (Web-Only Document)
May 9, 2005
TRB’s National Cooperative Highway Research Program (NCHRP) Web Document 70: Comprehensive Human Factors Guidelines (HFG) for Road Systems examines the recommended content, format, organization, and capabilities of the planned HFG.  The report includes an outline of the document and a detailed work plan for development of the first edition of the guidelines.  The report also includes...
Performance Measures for Context-Sensitive Solutions - A Guidebook for State DOTsPerformance Measures for Context-Sensitive Solutions - A Guidebook for State DOTs
November 30, 2004
TRB's National Cooperative Highway Research Program (NCHRP) Web Document 69: Performance Measures for Context-Sensitive Solutions - A Guidebook for State DOTs is intended to help DOTs develop their own tailored and comprehensive Context-Sensitive Solutions (CSS) performance measurement programs. As CSS becomes part of the way state DOTs do business, many agencies seek ways to gauge their perfo...
Relationships of HMA In-Place Air Voids, Lift Thickness, and PermeabilityRelationships of HMA In-Place Air Voids, Lift Thickness, and Permeability
November 23, 2004
TRB’s National Cooperative Highway Research Program (NCHRP) Web Document 68: Relationships of HMA In-Place Air Voids, Lift Thickness, and Permeability is a four-volume report that evaluates the minimum hot-mix asphalt (HMA) lift thicknesses and minimum in-place density necessary to achieve an impermeable, durable pavement.  The report also evaluates enhancements to AASHTO T166 (Bulk Speci...
Methodology for Predicting Channel MigrationMethodology for Predicting Channel Migration
December 9, 2004
TRB’s National Cooperative Highway Research Program (NCHRP) Web Document 67: Methodology for Predicting Channel Migration documents and presents the results of a study to develop a practical methodology to predict the rate and extent of channel migration in proximity to transportation facilities. The principal product of this research was NCHRP Report 533: Handbook for Predicting Stream Meande...
An Investigation of the Cause of Variation in HMA Bulk Specific Gravity Test Results Using Non-Absorptive AggregatesAn Investigation of the Cause of Variation in HMA Bulk Specific Gravity Test Results Using Non-Absorptive Aggregates
September 24, 2004
TRB’s National Cooperative Highway Research Program (NCHRP) Web Document 66: An Investigation of the Cause of Variation in Hot-Mix Asphalt (HMA) Bulk Specific Gravity Test Results Using Non-Absorptive Aggregates investigates the cause of variation in relative density from the bulk test results.
Geofoam Applications in the Design and Construction of Highway EmbankmentsGeofoam Applications in the Design and Construction of Highway Embankments
August 2, 2004
TRB’s National Cooperative Highway Research Program (NCHRP) Web Document 65: Geofoam Applications in the Design and Construction of Highway Embankments presents a design guideline, and material and construction standard, for the use of geofoam in roadway embankments and bridge approaches.  
Appendixes to Measuring and Communicating the Effects of Traffic Incident Management ImprovementsAppendixes to Measuring and Communicating the Effects of Traffic Incident Management Improvements
June 25, 2004
TRB’ National Cooperative Highway Research Program (NCHRP) Web Document 64 is the appendixes to NCHRP Research Results Digest 289 : Measuring and Communicating the Effects of Traffic Incident Management Improvements.  It includes workshop presentations and examples traffic incident management promotional activities.
Appendices to a Review of DOT Compliance with GASB 34 RequirementsAppendices to a Review of DOT Compliance with GASB 34 Requirements
July 6, 2004
TRB’s National Cooperative Highway Research Program (NCHRP) Web Document 63 the appendices to NCHRP Report 522: A Review of DOT Compliance with GASB 34 Requirements , which examines approaches taken by state departments of transportation to comply with the requirements of Governmental Accounting Standards Board (GASB) Statement No. 34.  
Development of a Highway Safety ManualDevelopment of a Highway Safety Manual
March 30, 2004
TRB's National Cooperative Highway Research Program (NCHRP) Web Document 62: Development of a Highway Safety Manual documents and presents the results of a study to develop an annotated outline, prototype chapter, and work plan for the first edition of the Highway Safety Manual (HSM). The purpose of the HSM will be to provide information and tools, in a useful and widely accepted form, to facil...
Improving the Compatibility of Vehicles and Roadside Safety HardwareImproving the Compatibility of Vehicles and Roadside Safety Hardware
February 24, 2004
TRB’s National Cooperative Highway Research Program (NCHRP) Web Document 61: Improving the Compatibility of Vehicles and Roadside Safety Hardware examines current and future vehicle characteristics that are potentially incompatible with existing roadside safety hardware, assesses opportunities for and barriers to improved compatibility, and increases the vehicle and hardware manufacturers’ awar...
LTPP Data Analysis: Daily and Seasonal Variations in Insitu Material PropertiesLTPP Data Analysis: Daily and Seasonal Variations in Insitu Material Properties
December 11, 2003
TRB’s National Cooperative Highway Research Program (NCHRP) Web Document 60: Long-Term Pavement Project (LTPP) Data Analysis: Daily and Seasonal Variations in Insitu Material Properties includes a data set that can be used to investigate daily and seasonal changes in pavement material properties as they relate to changes in structural capacity that would necessitate load restrictions.
The Outsourcing of State DOT Capital Program Delivery FunctionsThe Outsourcing of State DOT Capital Program Delivery Functions
November 24, 2003
TRB’s National Cooperative Highway Research Program (NCHRP) Web Document 59: The Outsourcing of State DOT Capital Program Delivery Functions is designed to assist state departments of transportation (DOTs) in assessing the outsourcing of their capital delivery functions.
Research for Customer-Driven Benchmarking of Maintenance ActivitiesResearch for Customer-Driven Benchmarking of Maintenance Activities
November 6, 2003
TRB’s National Cooperative Highway Research Program (NCHRP) Web Document 58: Research for Customer-Driven Benchmarking of Maintenance Activities examines customer-driven benchmarking, and outlines the main ideas and potential benefits of benchmarking.
A National Data-Management System for Highway Tort ClaimsA National Data-Management System for Highway Tort Claims
September 4, 2003
TRB’s National Cooperative Highway Research Program (NCHRP) Web Document 57: Development and Evaluation of a National Data-Management System for Highway Tort Claims assesses the technical feasibility of national tort data-management system. Document Parts; Front Matter , Chapter 1 , Chapter 2 , Chapter 3 , Chapter 4 , Appendicies
Sensitivity Evaluation of Field Shear Test Using Improved Protocol and Indirect Tension Strength TestSensitivity Evaluation of Field Shear Test Using Improved Protocol and Indirect Tension Strength Test
May 8, 2003
TRB's National Cooperative Highway Research Program (NCHRP) Web Document 56: Sensitivity Evaluation of Field Shear Test Using Improved Protocol and Indirect Tension Strength Test, evaluates the sensitivity of complex modulus measurements made using the recently improved field shear test and the sensitivity of the indirect tension strength test, performed at high temperatures in order to evaluat...
Contractor's Interim Report: Precision Estimates of Selected Volumetric Properties of HMA Using Non-Absorptive AggregateContractor's Interim Report: Precision Estimates of Selected Volumetric Properties of HMA Using Non-Absorptive Aggregate
March 5, 2003
TRB's National Cooperative Highway Research Program (NCHRP) Web Document 54: Contractor's Interim Report: Precision Estimates of Selected Volumetric Properties of Hot-Mix Asphalt (HMA) Using Non-Absorptive Aggregate, provides information on a project designed to develop a precision statement applicable to AASHTO T312 and updating the published precision statements for AASHTO T166, Standard Meth...
Feasibility of Using Friction Indicators to Improve Winter Maintenance Operations and MobilityFeasibility of Using Friction Indicators to Improve Winter Maintenance Operations and Mobility
November 21, 2002
TRB's National Cooperative Highway Research Program (NCHRP) Web Document 53: Feasibility of Using Friction Indicators to Improve Winter Maintenance Operations and Mobility indicates that the use of friction measurements to improve winter maintenance operations and mobility is feasible (especially when deceleration devices are used), but devices with an extra wheel may not represent a practical ...
LTPP Data Analysis: Feasibility of Using FWD Deflection Data to Characterize PavementLTPP Data Analysis: Feasibility of Using FWD Deflection Data to Characterize Pavement
November 6, 2002
TRB's National Cooperative Highway Research Program (NCHRP) Web Document 52: LTPP Data Analysis - Feasibility of Using FWD Deflection Data to Characterize Pavement concludes that Falling Weight Deflectometer (FWD) data is of sufficient quantity to assist in the quality control and quality assistance process during pavement construction.
Construction Engineering and Management Research ProgramConstruction Engineering and Management Research Program
November 27, 2002
TRB's National Cooperative Highway Research Program (NCHRP) Web Document 51: Construction Engineering and Management Research Program includes a research program for the American Association of State Highway Transportation Officials' Highway Subcommittee on Construction that identifies and prioritizes opportunities for improving construction engineering and management of transportation projects.
Repair and Rehabilitation of Bridge Components Containing Epoxy-Coated ReinforcementRepair and Rehabilitation of Bridge Components Containing Epoxy-Coated Reinforcement
October 18, 2002
TRB's National Cooperative Highway Research Program (NCHRP) Web Document 50: Repair and Rehabilitation of Bridge Components Containing Epoxy-Coated Reinforcement contains a decision matrix that matches appropriate repair and rehabilitation strategies to the damage mode, present condition, environmental exposure, and future propensity of corrosion.
TRAC PAC 2--A Hands-On Educational ProgramTRAC PAC 2--A Hands-On Educational Program
August 8, 2002
TRB's National Cooperative Highway Research Program (NCHRP) Web Document 49: TRAC PAC 2--A Hands-On Educational Program includes eight modules (Bridge Builder, Design and Construction, Environmental, Maglev, Motion, Safety, SIMCITY, and Technology) with a total of 36 discrete educational activities, along with a teacher's manual, lesson plans, questions to assess student achievement, educationa...
LTPP Data Analysis: Variations in Pavement Design InputsLTPP Data Analysis: Variations in Pavement Design Inputs
July 31, 2002
TRB's National Cooperative Highway Research Program (NCHRP) Web Document 48: LTPP Data Analysis: Variations in Pavement Design Inputs encourages the pavement designer to consider pavement variability of input design parameters in addition to the average input values normally used.
LTPP Data Analysis: Effectiveness of Maintenance and Rehabilitation OptionsLTPP Data Analysis: Effectiveness of Maintenance and Rehabilitation Options
July 31, 2002
TRB's National Coopertive Highway Research Program (NCHRP) Web Document 47: LTPP Data Analysis -- Effectiveness of Maintenance and Rehabilitation Options finds that overlay thickness and preoverlay roughness level were the two factors that most influenced the performance of asphalt overlays of asphalt pavements.
Improved Live Load Deflection Criteria for Steel BridgesImproved Live Load Deflection Criteria for Steel Bridges
November 6, 2002
TRB's National Cooperative Highway Research Program (NCHRP) Web Document 46: Improved Live Load Deflection Criteria for Steel Bridges indicates that the bridges that satisfy the existing deflection limit are likely to provide poor vibration performance, while other bridges failing the existing deflection limit will provide good comfort characteristics.
A Process for Selecting Strategies for Rehabilitation of Rigid PavementsA Process for Selecting Strategies for Rehabilitation of Rigid Pavements
June 17, 2002
TRB's National Cooperative Highway Research Program (NCHRP) Web Document 45: A Process for Selecting Strategies for Rehabilitation of Rigid Pavements describes a process that helps state highway agency decision makers identify, screen, and select the most appropriate maintenance, rehabilitation, and reconstruction strategies from a limited set of feasible, project-specific alternatives.
Guidance for Estimating the Indirect Effects of Proposed Transportation ProjectsGuidance for Estimating the Indirect Effects of Proposed Transportation Projects
January 5, 2002
TRB's National Cooperative Highway Research Program (NCHRP) Web Document 43: Guidance for Estimating the Indirect Effects of Proposed Transportation Projects is an instructional course is based on research conducted for National Cooperative Highway Research Program Project 25-10: Guidance for Estimating the Indirect Effects of Proposed Transportation Projects. Research was conducted in 1996 and...
Issues in Pavement Smoothness: A Summary ReportIssues in Pavement Smoothness: A Summary Report
April 29, 2002
TRB's National Cooperative Highway Research Program (NCHRP) Web Document 42: Issues in Pavement Smoothness -- A Summary Report includes presentations and findings from the August 2001 workshop on pavement smoothness, as well as a review of issues and recommended strategies to address pavement smoothness.


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