The need to accurately characterize the structural condition of existing pavements has increased with the recent development, release, and ongoing implementation of the Mechanistic-Empirical Pavement Design Guide (MEPDG). A number of different material inputs are required in the procedure, and it is important to adequately characterize and define t
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The need to accurately characterize the structural condition of existing pavements has increased with the recent development, release, and ongoing implementation of the Mechanistic-Empirical Pavement Design Guide (MEPDG). A number of different material inputs are required in the procedure, and it is important to adequately characterize and define t
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This paper investigates the trends of longitudinal and transverse cracking in jointed concrete pavements based on Long-Term Pavement Performance (LTPP) Program Strategic Study of Structural Factors for Rigid Pavements (SPS-2) data. The impacts of slab properties, base type, traffic volume, and environmental factors on the occurrence and extent of l
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This report describes the efforts undertaken to review the status of falling weight deflectometer (FWD) equipment, data collection, analysis, and interpretation, including dynamic backcalculation, as they relate to the models and procedures incorporated in the Mechanistic-Empirical Pavement Design Guide. The work conducted in this project resulted
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United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2017-03-01
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PDF
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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United States. Department of Transportation. Federal Highway Administration. Office of Operations
2017-03-01
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Urban Congestion Report (UCR)
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The Urban Congestion Report (UCR) is produced on a quarterly basis and characterizes the most recent traffic congestion and reliability trends at the national and city level. Each quarterly UCR compares data from the most recent three months to the same three months in the previous year.
This document describes the Draft System Architecture and Design for the Transit Bus Stop Pedestrian Warning (TSPW)application including the design for the pedestrian detection system and DSRC radio to be deployed at transit stops and includesdetails on the Enhanced Transit Safety Retrofit Package platform upon which the TSPW application will run o
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United States. Federal Highway Administration. Office of Planning, Environment, and Realty
2017-02-23
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PDF
This digest shares the latest information from a range of Federal and non-Federal sources, addressing transportation and its relationship to the human environment. Through this information exchange, FHWA hopes to foster dialogue at all levels and continue to further the state of the practice on these important topics in support of safety; infrastru
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This Product Brief introduces the reader to the Long-Term Pavement Performance Bind (LTPPBind) Online Web-based tool for selecting asphalt binder performance grades (PGs).(1) It explains what the tool is, who can benefit from its use, what its main features are, and how and where potential users can find more information.
United States. Department of Transportation. Federal Highway Administration. Turner-Fairbank Highway Research Center
2017-02-16
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PDF
Our researchers at the Turner-Fairbank Highway Research Center are dedicated scientists and engineers. They are experts in more than 100 trans-portation-related fields including: CIVIL ENGINEERING STRUCTURAL ENGINEERING PAVEMENT ENGINEERING CHEMISTRY SAFETY MATHEMATICS COMPUTATIONAL DEVELOPMENT MODELING AND SIMULATION INFORMATION TECHNOLOGY HYDRAUL
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United States. Federal Highway Administration. Office of Planning, Environment, and Realty
2017-02-09
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PDF
This digest shares the latest information from a range of Federal and non-Federal sources, addressing transportation and its relationship to the human environment. Through this information exchange, FHWA hopes to foster dialogue at all levels and continue to further the state of the practice on these important topics in support of safety; infrastru
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Connecting vehicles with the surrounding infrastructure through Vehicle-to-Pedestrian (V2P) technology offers promise for addressing this challenge. For the past decade, the USDOT has been researching and testing a connected vehicle (CV) system where vehicles can sense the environment around them and communicate that information to other vehicles,
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The primary objective of this project is to develop multiple simulation testbeds/transportation models to evaluate the impacts of DMA connected vehicle applications and the active and dynamic transportation management (ATDM) strategies. The outputs (modeling results) from this project will help USDOT prioritize their investment decisions for DMA an
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This case study highlights how the Delaware Valley Regional Planning Commission (DVRPC) promotes traffic data sharing with other agencies and makes traffic and geographic information system data available to the public. DVRPC has developed an interactive mapping application, called Traffic Count Viewer, that provides open access to different types
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This case study presents how the Virginia Department of Transportation (VDOT) estimates traffic volumes on secondary local roadways using a trip generation method instead of taking short-duration counts in the field. The use of trip generation estimates was an outcome of a review process that aimed to reduce data collection costs and achieve manpow
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This report describes an investigation of analytical, Highway Capacity Manual (HCM)-compatible evaluation methods for urban street active transportation and demand management (ATDM). ATDM strategies have been successfully deployed in the United States, but the lack of available analytical methods may be reducing their successful adoption by more ci
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As part of the Federal Highway Administration (FHWA) Traffic Analysis Toolbox (Volume XIII), this guide was designed to help corridor stakeholders implement the Integrated Corridor Management (ICM) Analysis, Modeling, and Simulation (AMS) methodology successfully and effectively. It provides a step-by-step approach to implementation of the ICM AMS
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This Priorities in Roadway Safety Data Guide is the capstone of more than five years of related projects aimed at helping State, Tribal, and local agencies develop more complete data to support advanced safety analysis and decision-making. The Guide follows, and promotes, the data-driven approach to safety decision making. It introduces users to th
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Learning in Progress, NHI's quarterly newsletter, provides updates on new course launches, upcoming Web conference seminars, training programs and events, and NHI policy changes.
Learning in Progress, NHI's quarterly newsletter, provides updates on new course launches, upcoming Web conference seminars, training programs and events, and NHI policy changes.
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