United States. Department of Transportation. Federal Highway Administration
2026-01-01
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The Federal Highway Administration (FHWA) Geometric Design Laboratory (GDL) is dedicated to supporting transportation safety, design, and innovation through advanced tools, technical reviews, and collaboration with research and implementation teams. GDL's main mission is the advancement of the safety practice. Such advancement can be in the forms o
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United States. Department of Transportation. Federal Highway Administration
2026-01-01
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The help desk is your direct line to technical experts supporting your V2X deployment. Whether you’re selecting equipment, creating MAP messages, integrating signal phase and timing, or troubleshooting data flow, the help desk is here to help ensure interoperability and compliance with standards.
Autonomous vehicle (AV) deployment is accelerating, but AV behavior remains poorly understood. Infrastructure planners and operators lack confidence in forecasting how AVs will interact with existing infrastructure (e.g., traffic lights). Current studies focus mainly on car-following and lane-changing maneuvers on freeways and highways, with less s
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Prior studies report conflicting impacts of autonomous vehicles (AVs). A study by Li et al. suggests AVs may engage in riskier behaviors compared with human-driven vehicles. A study by Morando et al. highlights AV potential to enhance safety. A better understanding of AV behaviors is crucial for safety. This goal calls for an investigation using re
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United States. Federal Highway Administration. Office of Safety and Operations Research and Development
2026-01-01
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The U.S. Department of Transportation (USDOT) provides infrastructure-focused tools that offer advantages to transportation systems and their users. These tools help optimize traffic flow and management, improve access for road users, collect valuable data, and support academic institutions in transportation technology education. These open-source
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United States. Federal Highway Administration. Office of Safety and Operations Research and Development
2026-01-01
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The U.S. Department of Transportation’s (USDOT) open-source traveler information message (TIM) Creator tool simplifies the creation of SAE International® J2735™ TIM messages that support connected and automated vehicle (CAV) applications. TIMs are used to communicate roadway and traveler information similar to the information from road signs or dyn
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United States. Federal Highway Administration. Office of Safety and Operations Research and Development
2026-01-01
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The U.S. Department of Transportation’s (USDOT) open-source MAP/road geometry attributes (RGA) Message Creator tool simplifies the development of SAE International® J2735™ MAP and J2945/A™ RGA messages to support connected and automated infrastructure deployment. MAP messages(2) define intersections and segment geometry, whereas RGA messages descri
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United States. Department of Transportation. Federal Highway Administration
2026-01-01
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This postcard is to announce the Excellence in Highway Safety Data Awards Student Contest 2026. The intended audience is all undergraduate, graduate, and community college students with a passion for impactful research and data analysis.
United States. Department of Transportation. Federal Highway Administration
2026-01-01
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With the Human Factors Laboratory, located at the Federal Highway Administration's (FHWA's) Turner-Fairbank Highway Research Center in McLean, VA, the Human Factors Team aims to improve transportation safety by strengthening the understanding of user needs and making transportation-related recommendations for roadway design, signage, and advanced t
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United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2025-12-31
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Special Issue - Weekly Motor Fuel Report
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The Gasoline Product Supplied report offers insight on weekly fluctuation of the gasoline product supply, which is an important part of any analysis of construction trends, materials and operating costs associated with highway repair and construction, and changes in traffic volume. These data come directly from the Energy Information Administration
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United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2025-12-29
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Special Issue - Weekly Motor Fuel Report
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The Gasoline Product Supplied report offers insight on weekly fluctuation of the gasoline product supply, which is an important part of any analysis of construction trends, materials and operating costs associated with highway repair and construction, and changes in traffic volume. These data come directly from the Energy Information Administration
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United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2025-12-17
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Special Issue - Weekly Motor Fuel Report
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PDF
The Gasoline Product Supplied report offers insight on weekly fluctuation of the gasoline product supply, which is an important part of any analysis of construction trends, materials and operating costs associated with highway repair and construction, and changes in traffic volume. These data come directly from the Energy Information Administration
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United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2025-12-10
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Special Issue - Weekly Motor Fuel Report
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PDF
The Gasoline Product Supplied report offers insight on weekly fluctuation of the gasoline product supply, which is an important part of any analysis of construction trends, materials and operating costs associated with highway repair and construction, and changes in traffic volume. These data come directly from the Energy Information Administration
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United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2025-12-03
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Special Issue - Weekly Motor Fuel Report
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PDF
The Gasoline Product Supplied report offers insight on weekly fluctuation of the gasoline product supply, which is an important part of any analysis of construction trends, materials and operating costs associated with highway repair and construction, and changes in traffic volume. These data come directly from the Energy Information Administration
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United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2025-12-01
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Traffic Volume Trends
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Traffic Volume Trends is a monthly report based on hourly traffic count data reported by the States. These data are collected at approximately 5,000 continuous traffic counting locations nationwide and are used to estimate the percent change in traffic for the current month compared with the same month in the previous year. Estimates are re-adjuste
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The Safe System Approach, the guiding paradigm of the United States Department of Transportation National Road Safety Strategy, recognizes that system redundancy is crucial to reducing deaths and serious injuries on our Nation’s roads. Where pavements are concerned, this paradigm involves providing adequate levels of friction supply to meet the fri
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United States. Department of Transportation. Federal Highway Administration
2025-12-01
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Automated vehicles can navigate signalized intersections with enhanced safety and efficiency by establishing communication with smart infrastructure. The functionality developed in this project demonstrates Cooperative Driving Automation’s (CDA's) potential to benefit automated vehicles by supporting them as they navigate signalized intersections w
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United States. Department of Transportation. Federal Highway Administration
2025-12-01
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The Federal Highway Administration conducted a safety evaluation of rectangular rapid flashing beacons (RRFBs), including developing crash modification factors (CMFs) and benefit-to-cost (B/C) ratios. The RRFB includes two rapidly-flashed rectangular-shaped yellow indications, each with a light-emitting diode-array based pulsing light source that f
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United States. Department of Transportation. Federal Highway Administration
2025-12-01
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The DPS is a nondestructive evaluation (NDE) technology designed to assess asphalt compaction. The DPS uses ground-penetrating radar to measure the dielectric constant of a newly constructed asphalt pavement. A dielectric constant measures a material’s ability to store electric energy by separating opposite polarity charges in space. Research has s
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