TRB's National Cooperative Highway Research Program (NCHRP) Research Report 879: Optimal Replacement Cycles of Highway Operations Equipment acts as a handbook on equipment replacement concepts and an instruction manual for making cost-effective replacement decisions. The research report presents a process for determining replacement needs for highway operations equipment, identifying candidate ...

TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 525: Practices in One-Lane Traffic Control on a Two-Lane Rural Highway identifies innovative practices and devices for establishing one-lane traffic control on rural two-lane highways. Temporary traffic control, also known as maintenance of traffic, is critical to minimizing congestion and maintaining mobility during planned ...

TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 515: Practices for Preventing Roadway Departures identifies and summarizes practices being used by state departments of transportation (DOTs) to prevent roadway departure crashes and to identify the data-driven advantages and disadvantages of these practices. More than half of all traffic fatalities result from roadway depart...

TRB's National Cooperative Highway Research Program (NCHRP) Web-Only Document 250: Use of Automated Machine Guidance within the Transportation Industry studies automated machine guidance (AMG) implementation barriers and develop strategies for effective implementation of AMG technology in construction operations. AMG links design software with construction equipment to direct the operations of ...

TRB's National Cooperative Highway Research Program (NCHRP) Research Report 875: Guidance for Evaluating the Safety Impacts of Intersection Sight Distance is a resource for practitioners involved in the planning, design, operations, and traffic safety management of stop-controlled intersections. It provides information on how to estimate the effect of intersection sight distance (ISD) on crash ...

TRB's National Cooperative Highway Research Program ( NCHRP) Web-Only Document 228 : Safety Impacts of Intersection Sight Distance documents the methodology and presents the results from NCHRP Research Report 875 : Guidance for Evaluating the Safety Impacts of Intersection Sight Distance. It provides  the underlying research on estimating the safety effects of intersection sight distance (...

To keep pace with accelerating rate of research distribution, the Transportation Research Record: Journal of the Transportation Research Board is now publishing articles as soon as they are finalized. The latest papers to be published are as follows: Use of a Laser Diffractometer to Obtain the Particle Size Distribution of Fine-Grained Soils Interstate Speed Profiles Conditioning and Testing Pr...

TRB's National Cooperative Highway Research Program (NCHRP) Web-Only Document 237: Environmental Justice Analyses When Considering Toll Implementation or Rate Changes—Final Report presents information gathered in the development of NCHRP Research Report 860 : Assessing the Environmental Justice Effects of Toll Implementation or Rate Changes: Guidebook and Toolbox. This web-only document summari...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2645 consists of 21 papers that explore information technology in transportation, including: Economic Feasibility Study for Pavement Monitoring Using Synthetic Aperture Radar-Based Satellite Remote Sensing: Cost–Benefit Analysis Hunt for Perfect Detection of Parking Occupancy: Evaluation of On-Street Technol...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2623 consists of 12 papers that explore traffic flow theory, including: Realistic Car-Following Models for Microscopic Simulation of Adaptive and Cooperative Adaptive Cruise Control Vehicles Calibrating the Robertson’s Platoon Dispersion Model on a Coordinated Corridor with Advance Warning Flashers Game Theo...

TRB's TR Circular E-C227: Advancing Highway Traffic Monitoring Through Strategic Research explores the state of the practice and state of the art in highway traffic monitoring. It explores data acquisition, analysis and reporting tools, quality assurance and quality control techniques, and trends in emerging technologies. It explores how highway traffic data are acquired and used, and will prov...

The full edition of the July–August 2017  TR News  magazine is now available.  Moving research into practice is the theme of feature articles in this edition. Authors describe today’s successes, present a systematic approach that has proved effective at a state department of transportation, describe federal programs encouraging innovations at the state level, discuss initiatives ...

TRB's Airport Cooperative Research Program (ACRP) latest Impacts on Practice discusses how Harrisburg Airport (MDT), part of the Susquehanna Area Regional Airport Authority in Harrisburg, Pennsylvania applied results of ACRP Report 92 : A Guidebook to Creating a Collaborative Environment Between Airport Operations and Maintenance. The tools contained in helped MDT employees collaborate across t...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2643 consists of 18 papers that explore travel data, including: Automated Highway Sign Extraction Using Lidar Data Real-Time Piecewise Regression: Application to Effective and Economical Collection of GPS Trajectory Data Conducting Onboard Transit Rider Surveys with Electronic Handheld Tablets: An Agencywide...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2615 consists of 18 papers that explore highway capacity including: Preparing Oregon for Connected Vehicle Deployment: Application Prioritization Process Evaluation and Testing of Driver-Assistive Truck Platooning: Phase 2 Final Results Influence of Remotely Operated Stop–Slow Controls on Driver Behavior in ...

The full edition of the May-June 2017 TR News is now available. This edition explores the role of transportation in economic development. Articles feature information about benefit-cost analysis, freight production models, transportation satellite accounts, and right sizing strategies. The TR News is TRB's bimonthly magazine featuring timely articles on innovative and state-of-the-art research ...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2658 consists of 7 papers that explore the connection between telecommunications and transportation, including: Modeling the Demand for New Transportation Services and Technologies Modeling the Impact of Communications Technologies on Travel Behavior and Land Use Telecommuting and Its Impact on Activity–Time...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2616 consists of 12 papers that explore traffic operations, including: Operating Speed on a Buffer-Separated Managed Lane Effect of Geometric Factors on Lateral Position of Vehicles in Freeway Buffer-Separated Managed Lanes Queue Length Estimation for Freeway Facilities: Based on Combination of Point Traffic...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2622 consists of 11 papers that explore traffic flow theory, including: Investigating the Effects of Reserved Lanes for Autonomous Vehicles on Congestion and Travel Time Reliability SimMobility Short-Term: An Integrated Microscopic Mobility Simulator Network Flow Relations and Travel Time Reliability in a Co...

TRB's National Cooperative Highway Research Program (NCHRP) Innovations Deserving Exploratory Analysis (IDEA) has released Final Report 181: Development of Small Specimen Geometry for Asphalt Mixture Performance Testing. The use of small specimen geometries in Asphalt Mixture Performance Tester (AMPT) offer a means to measure as-built pavement layers. Small specimen geometries may improve the e...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2620 consists of 9 papers that explore traffic signal systems, including: Derivation of Decision Boundaries for Left-Turn Treatments at Signalized Intersections Use of Microsimulation to Evaluate Signal-Phasing Schemes at Diverging Diamond Interchanges Use of Big Data to Evaluate and Improve Performance of T...

TRB's National Cooperative Highway Research Program (NCHRP) Web-Only Document 239: Impacts of Laws and Regulations on CV and AV Technology Introduction in Transit Operations explores the potential barriers imposed by operating policies, agency regulations, and governmental laws relative to the transit environment. Without adjustment, the combination of new technology with old rules could result...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2619 consists of 9 papers that explore traffic signal systems, including: Adaptive Coordination Based on Connected Vehicle Technology Safety-Based Left-Turn Phasing Decisions for Signalized Intersections Framework for Quantitative Annual Evaluation of Traffic Signal Systems Interlinking Vissim and ns-3 for C...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2618 consists of 9 papers that explore geometrics and access management, including: Access Spacing Based on Turning-Vehicle Acceleration In-Depth Investigation of Wrong-Way Crashes on Divided Highways in Alabama with Use of the Haddon Matrix and Field Observations Lane Utilization Model Development for Diver...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2646 consists of 10 papers that explore freight data and asset management, including: Role of Culture in Adoption of Enterprise Collaboration Technologies: Case Study Economic Impacts from Geologic Hazard Events on Colorado Department of Transportation Right-of-Way Advancing Urban Multimodal Transportation S...

TRB's National Cooperative Highway Research Program (NCHRP) Research Report 854: Guide for Identifying, Classifying, Evaluating, and Mitigating Truck Freight Bottlenecks provides transportation agencies state-of-the-practice information on truck freight bottlenecks using truck probe data rather than traditional travel demand models. The report embraces a broad definition of truck freight bottle...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2637 consists of 12 papers that explore motorcycles, trucks, buses, and roundabouts, including: Safety Effects of Horizontal Curve Design on Motorcycle Crash Frequency on Rural, Two-Lane, Undivided Highways in Florida Investigating Total Annual Average Daily Traffic as a Surrogate for Motorcycle Volumes in E...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2624 consists of 6 papers that explore traffic control devices, including: Empirical Assessment of the Legibility of the Highway Gothic and Clearview Signage Fonts Driver Accuracy in Identifying Food and Attraction Targets on Business Logo Signs: Impacts of Driver Age, Number of Panels, Logo Familiarity, and...

A featured article in the May-June 2017 issue of the TR News examines how to develop appropriate evaluation frameworks that account for the integration of new technologies into the infrastructure in order to accurately value the current highway system. The TR News is TRB's bimonthly magazine featuring timely articles on innovative and state-of-the-art research and practice in all modes of trans...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2644 consists of 13 papers exploring traffic monitoring, including: Sensor Location Decision Model for Truck Flow Measurement Bicycle and Pedestrian Counts at Signalized Intersections Using Existing Infrastructure: Opportunities and Challenges Quality Assurance and Quality Control Processes for a Large-Scale...