United States. Department of Transportation. Federal Highway Administration
2022-12-01
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PDF
The Minnesota Department of Transportation (MnDOT) is continuing to explore further adjustments to the use of and applications for the Paver-Mounted Thermal Profiler (PMTP), a tool that has been fully deployed into practice for MnDOT asphalt paving projects since 2018. The agency had studied the tool for several years and saw the PMTP’s benefits in
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United States. Department of Transportation. Federal Highway Administration
2022-12-01
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PDF
The Minnesota Department of Transportation (MnDOT) fully implemented Paver-Mounted Thermal Profilers (PMTPs) into its quality assurance procedures in 2018, after finding the tool practical to use and effective in catching asphalt nonuniformity. The agency began piloting PMTPs in 2010 and phased in the tool over a four-year period between 2014 and 2
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United States. Department of Transportation. Federal Highway Administration
2022-12-01
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PDF
Although several factors can influence the performance of an asphalt pavement, one of the most important is in-place density. A small increase in density can potentially lead to a significant increase in service life of asphalt. Highway agencies use specifications to achieve acceptable in-place density on their asphalt pavements. Density acceptance
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United States. Department of Transportation. Federal Highway Administration
2022-12-01
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PDF
Although several factors can influence the performance of an asphalt pavement, one of the most important is in-place density. A small increase in density can potentially lead to a significant increase in service life of asphalt. Recognizing the importance of in-place density in building cost-effective asphalt pavements, FHWA initiated a three-phase
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Bridges cross over a variety of features ranging from drainage ditches to deep valleys and serve a variety of functions. There are several competing considerations when evaluating bridge railings: the risk of injury and death for vehicle drivers and occupants, the structural integrity of the bridge itself, and the service provided to the principal
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The use of Geographic Information Systems (GIS) to assist with the development of planning documents is well known and practiced. This research effort investigated the use of GIS for safety and traffic assessments, current and best practices, for use in the Federal lands and rural areas. This research report documents the research process, findings
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The U.S. has more than 600,000 bridges, making the distributed load rating and posting processes across the nation a significant effort that does and can benefit from improvements in efficiency. Bridge load rating, posting, and overweight permitting processes evolve due to the regulatory requirements regarding the frequency of inspections and relev
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Roadway lane-reduction transitions have long been reported to be problematic for drivers. Whether this problem is the result of a lack of understanding of lane-reduction signing or lane markings, a simple failure to comply with such markings, or other unidentified factors is unknown. This study, completed in 2019, explored driver behavior when expo
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The gap distances used on adaptive cruise control (ACC) and cooperative adaptive cruise control (CACC) systems have important implications for both driver safety and transportation operations The current study sought to identify comfortable or preferred following gaps under a variety of speeds that could be used to help guide set speeds for ACC and
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Cooperative driving automation (CDA) aims to improve the safety, traffic throughput, and energy efficiency of the transportation network by allowing vehicles and infrastructure to work together to coordinate movement. The CARMA Ecosystem is utilized to research CDA and leverage emerging capabilities in automation and cooperation to advance transpor
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Roadway lane-reduction transitions have long been reported to be problematic to drivers. Whether this problem is the result of a lack of understanding of lane-reduction signing or lane markings, a simple failure to comply with such markings, or other unidentified factors is unknown. This study, completed in 2016, explored driver comprehension of si
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United States. Department of Transportation. Federal Highway Administration
2022-12-01
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PDF
The study documents the state of the knowledge of e-Ticketing through questionnaires, interviews, and case studies, and discusses the overall practice of e-Ticketing, benefits and costs, readiness factors, implementation challenges, and future plans of State highway agencies. The study also documents the piloting experiences of nine State highway a
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The purpose of this document is to ensure consistent and efficient management of State Planning and Research, Subpart B (SPR-B) work programs by Federal Highway Administration (FHWA) division offices. It is intended to serve as a resource for FHWA division staff, illustrating how reviews of the research management processes can be flexible and open
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Federal regulations in 23 CFR Part 630 Subpart J require States to conduct a work zone process review (WZPR) every 2 years to evaluate work zone processes and procedures, as well as identify systematic improvements to current and future projects. The Federal Highway Administration now encourages agencies to use a data-driven approach to make WZPRs
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United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2022-12-01
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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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This Guide provides bridge engineers and owners with general information and typical details to help standardize orthotropic steel deck (OSD) bridge design/fabrication to make it more competitive. This document does not intend to set a national standard but to help inform the effort through reduced parametric variations. OSD bridges can be either c
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United States. Department of Transportation. Federal Highway Administration. Office of Operations
2022-12-01
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Urban Congestion Report (UCR)
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PDF
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 report presents research work related to developing and evaluating magnetic flux-based nondestructive evaluation (NDE) technologies for detecting corrosion damage in external and internal post-tensioned (PT) tendons. For the external tendons, two types of magnetic main flux method (MMFM) systems—a solenoid type and a permanent magnet type— wer
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Making our Roads Safer through a Safe System Approach; The Highway Safety Improvement Program: Paving the Road to a Safer Future; The Safe System Paradigm: Reducing Fatalities and Injuries at the Nation’s Intersections; NHTSA’s Safe System Approach: Educating and Protecting All Road Users; Speed Management is Key to Road Safety; The Safe System App
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The Wyoming Department of Transportation’s (WYDOT) Connected Vehicle (CV) Pilot Deployment Program is intended to develop a suite of applications that utilize vehicle to infrastructure (V2I) and vehicle to vehicle (V2V) communication technology to reduce the impact of adverse weather on truck travel in the I-80 corridor. These applications support
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