Transportation Research Board
HomeContact Us Directory E-NewsletterFollow Us RSS

The National Academies
Publications > Highway (NCHRP) > Synthesis Reports
Text Size: Increase Text SizeDecrease Text Size| Share:Sign up for the TRB Newsletter


National Cooperative Highway Research Program (NCHRP) Synthesis Reports

Syntheses report on the state of the practice based on literature reviews and surveys of recent activities in critical areas. Syntheses also inform airport managers about innovations being used by others to solve problems.
 
Below are the latest 20 NCHRP Synthesis Reports that have been produced by TRB.  A page highlighting NCHRP Reports that have been released since June 2001 is available online.  To search for older publications visit the TRB Online Bookstore or the TRB Publication Index.

Emergency Medical Services Response to Motor Vehicle Crashes in Rural AreasEmergency Medical Services Response to Motor Vehicle Crashes in Rural Areas
September 20, 2013
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 451: Emergency Medical Services Response to Motor Vehicle Crashes in Rural Areas identifies potential factors that may help reduce the time needed to provide effective medical care to crash occupants on rural roads.
Forecasting Highway Construction Staffing RequirementsForecasting Highway Construction Staffing Requirements
September 2, 2013
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 450: Forecasting Highway Construction Staffing Requirements gathers information on the methods being used at highway transportation agencies to forecast staffing requirements.
Strategies to Mitigate the Impacts of Chloride Roadway Deicers on the Natural EnvironmentStrategies to Mitigate the Impacts of Chloride Roadway Deicers on the Natural Environment
September 17, 2013
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 449: Strategies to Mitigate the Impacts of Chloride Roadway Deicers on the Natural Environment documents the range of methods, tools, and techniques used by transportation agencies to minimize the environmental impact of chloride-based roadway deicers.
State Department of Transportation Small Business ProgramsState Department of Transportation Small Business Programs
August 5, 2013
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 448: State Department of Transportation Small Business Programs identifies successful strategies that maximize Disadvantaged Business Enterprise program achievements through race-neutral measures.
Active Traffic Management for ArterialsActive Traffic Management for Arterials
July 10, 2013
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 447: Active Traffic Management for Arterials explores practices associated with the design, implementation, and operation of active traffic management (ATM) on arterial roadways. ATM includes a suite of strategies that are used to manage traffic flow in order enhance capacity and safety.
Use of Advance Geospatial Data, Tools, Technologies, and Information in Department of Transportation ProjectsUse of Advance Geospatial Data, Tools, Technologies, and Information in Department of Transportation Projects
July 8, 2013
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 446: Use of Advance Geospatial Data, Tools, Technologies, and Information in Department of Transportation Projects that explores the development, documentation, and introduction of advanced geospatial technologies within departments of transportation. The report also provides a discussion of strengths and weaknesses of leadin...
Practices for Unbound Aggregate Pavement LayersPractices for Unbound Aggregate Pavement Layers
November 22, 2013
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 445: Practices for Unbound Aggregate Pavement Layers consolidates information on the state-of-the-art and state-of-the-practice of designing and constructing unbound aggregate pavement layers. The report summarizes effective practices related to material selection, design, and construction of unbound aggregate layers to poten...
Pollutant Load Reductions for Total Maximum Daily Loads for HighwaysPollutant Load Reductions for Total Maximum Daily Loads for Highways
May 31, 2013
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 444, Pollutant Load Reductions for Total Maximum Daily Loads for Highways presents information on the types of structural and non-structural best management practices currently being used by state departments of transportation, including performance and cost data.
Practical Highway Design SolutionsPractical Highway Design Solutions
March 15, 2013
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 443: Practical Highway Design Solutions presents information on the application of practical design approaches in roadway project development. Practical design is the default term used in the report to describe approaches or initiatives some state transportation agencies have adopted that result in design solutions for specif...
Practices and Performance Measures for Local Public Agency Federally Funded Highway ProjectsPractices and Performance Measures for Local Public Agency Federally Funded Highway Projects
May 2, 2013
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 442: Practices and Performance Measures for Local Public Agency Federally Funded Highway Projects explores what performance measures, delivery practices, strategies, and tools are currently used in relation to federally-funded local public agency (LPA) highway project development and delivery, and how they are used to measure...
High Performance Concrete Specifications and Practices for BridgesHigh Performance Concrete Specifications and Practices for Bridges
April 11, 2013
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 441: High Performance Concrete Specifications and Practices for Bridges documents the types of specifications and practices used by state transportation agencies to produce high performance concrete for bridges. The report also identifies specifications and practices reported as having improved concrete performance and t...
Performance-Based Seismic Bridge DesignPerformance-Based Seismic Bridge Design
March 28, 2013
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 440, Performance-Based Seismic Bridge Design (PBSD) summarizes the current state of knowledge and practice for PBSD. PBSD is the process that links decision making for facility design with seismic input, facility response, and potential facility damage. The goal of PBSD is to provide decision makers and stakeholders with data...
Use of Transportation Asset Management Principles in State Highway AgenciesUse of Transportation Asset Management Principles in State Highway Agencies
February 7, 2013
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 439: Use of Transportation Asset Management Principles in State Highway Agencies explores the state of practice for transportation asset management among state departments of transportation.
Expedited Procurement Procedures for Emergency Construction ServicesExpedited Procurement Procedures for Emergency Construction Services
November 20, 2012
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 438: Expedited Procurement Procedures for Emergency Construction Services explores procurement procedures being utilized by state departments of transportation in coordination with federal agencies to repair and reopen roadways in emergency situations.
Assessing the Long-Term Performance of Mechanically Stabilized Earth WallsAssessing the Long-Term Performance of Mechanically Stabilized Earth Walls
September 6, 2012
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 437: Assessing the Long-Term Performance of Mechanically Stabilized Earth Walls explores methods to assess the long-term performance of mechanically stabilized earth walls. For the purposes of the report, "long-term" denotes the period of time from approximately one year after the wall is in service until the end of its desig...
Local Policies and Practices That Support Safe Pedestrian EnvironmentsLocal Policies and Practices That Support Safe Pedestrian Environments
August 8, 2012
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 436: Local Policies and Practices That Support Safe Pedestrian Environments documents various tools and strategies used by municipalities to improve the safety, convenience, and accessibility of the pedestrian experience.
Recycled Materials and Byproducts in Highway Applications—Manufacturing and Construction Byproducts, Volume 8Recycled Materials and Byproducts in Highway Applications—Manufacturing and Construction Byproducts, Volume 8
June 24, 2013
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 435: Recycled Materials and Byproducts in Highway Applications—Manufacturing and Construction Byproducts, Volume 8 summarizes the results of a project that describes the experiences of transportation agencies in determining the relevant properties of manufacturing and construction byproducts and the beneficial use for highway...
Recycled Materials and Byproducts in Highway Applications—Scrap Tire Byproducts, Volume 7Recycled Materials and Byproducts in Highway Applications—Scrap Tire Byproducts, Volume 7
June 24, 2013
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 435: Recycled Materials and Byproducts in Highway Applications—Scrap Tire Byproducts, Volume 7 summarizes the results of a project that describes the experiences of transportation agencies in determining the relevant properties of scrap tire byproducts and the beneficial use for highway applications. NCHRP Synthesis 435 is pr...
Recycled Materials and Byproducts in Highway Applications—Reclaimed Asphalt Pavement, Recycled Concrete Aggregate, and Construction Demolition Waste, Volume 6Recycled Materials and Byproducts in Highway Applications—Reclaimed Asphalt Pavement, Recycled Concrete Aggregate, and Construction Demolition Waste, Volume 6
June 24, 2013
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 435: Recycled Materials and Byproducts in Highway Applications—Reclaimed Asphalt Pavement, Recycled Concrete Aggregate, and Construction Demolition Waste, Volume 6 summarizes the results of a project that describes the experiences of transportation agencies in determining the relevant properties of reclaimed asphalt pavement,...
Recycled Materials and Byproducts in Highway Applications—Slag Byproducts, Volume 5Recycled Materials and Byproducts in Highway Applications—Slag Byproducts, Volume 5
June 24, 2013
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 435: Recycled Materials and Byproducts in Highway Applications—Slag Byproducts, Volume 5 summarizes the results of a project that describes the experiences of transportation agencies in determining the relevant properties of slag byproducts and the beneficial use for highway applications. NCHRP Synthesis 435 is presented in e...