The US Transportation Collection consists of documents from across all transportation modes with specific focus on research reports from US DOT, state DOTs, and other transportation organizations.
Bookmark this collection: https://rosap.ntl.bts.gov/collection_ust or https://doi.org/10.21949/1530857.
The project described in this report was developed in response to a documented need for more readily available guidance related to decision-making about roadway cross section reconfigurations. More specifically, there was a need for information that might help during the decision-making process involved in converting four-lane undivided roadway cro
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Constructed rock slopes may physically deteriorate over time, which can be represented with increasing rockfall frequency. Physical deterioration leads to performance deterioration, which corresponds to changes in slope risk through time. Thus, forecasting physical slope deterioration and therefore slope performance deterioration is critical to the
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Curved steel girders experience large deflection and rotations during construction and service that can intensify the web breathing effect. In addition, the curvature-induced lateral forces in slender curved webs can lead to critical web boundary stresses that do not typically occur in straight bridges. These distortion mechanisms are amplified by
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This project was to 1) evaluate the impacts of suspended solids on juvenile mussels, 2) assess the effects of sediment deposition on adult and subadult mussels, 3) develop a particle tracking model, and 4) evaluate the existing and potential mitigation approaches for mussel protection. The comprehensive research included a literature review, a Depa
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Ultra-high-performance concrete (UHPC) has been used increasingly in the past decade due to its high strength, rapid strength gain, and enhanced durability. UHPC is a cement-based material that typically has a low w/cm ratio, high paste content, and a 2% volume fraction of 0.5-in. long, straight, high-strength steel fibers. Most commercially availa
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Ultra-high-performance concrete (UHPC) has been used increasingly in the past decade due to its high strength, rapid strength gain, and enhanced durability. UHPC is a cement-based material that typically has a low w/cm ratio, high paste content, and a 2% volume fraction of 0.5-in. long, straight, high-strength steel fibers. Most commercially availa
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United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
2024-09-01
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In 2022 there were an estimated 5,930,496 police-reported traffic crashes in which 42,514 people were killed and an estimated 2,382,771 people were injured. Compared to 2021 there was a 1.7-percent decrease in the number of traffic fatalities, and a 4.6-percent decrease in the estimated number of people injured in 2022. The estimated number of poli
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United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
2024-09-01
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Traffic fatalities in the United States decreased by 1.7 percent from 2021 to 2022 (43,230 to 42,514). The fatality rate per 100 million vehicle miles traveled (VMT) was 1.33 in 2022, ranging from a high of 1.85 to a low of 0.69 among States. The fatality rate per 100 million VMT in the United States decreased by 3.6 percent (1.38 to 1.33) from 202
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The Kansas Department of Transportation (KDOT) is interested in finding a more efficient and accurate restriping system than the current system in use in order to save costs and/or accomplish the same work using fewer field personnel. Therefore, this report details the potential financial advantages for KDOT to deploy an automated pavement restripi
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United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
2024-09-01
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Use of DOT-compliant motorcycle helmets was 73.8 percent in 2023, not statistically different at the 0.05 level from 66.5 percent in 2022. The 2023 estimate is the highest ever recorded. The 2023 data collection occurred during the usual timeframe of early June, immediately following the Click It or Ticket campaign. There were 945 motorcyclists obs
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United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
2024-09-01
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A statistical projection of traffic fatalities for the first half of 2024 shows an estimated 18,720 people died in motor vehicle traffic crashes, a decrease of about 3.2 percent compared to 19,330 fatalities projected for the first half of 2023 (Early Estimate of Motor Vehicle Traffic Fatalities in 2023, Report No. DOT HS 813 561), as shown in Tabl
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This report presents findings from a comprehensive study evaluating the feasibility of using Near-Surface-Mounted (NSM) Titanium Alloy Bars (TiAB) to strengthen structurally deficient reinforced concrete (RC) bridges in Alabama. The research aimed to provide a cost-effective, efficient solution to extend the service life of aging and strength defic
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As a part of the Wisconsin Department of Transportation's (WisDOT) overall bridge asset management program, different non-destructive evaluation techniques have been utilized on bridge decks to determine bridge condition. Since the early 1980s, WisDOT has used Infrared Thermography (IRT) to assess defect quantities and locations on bridge decks. Th
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This project advanced the state-of-the-art in fuel-lean premixed prevaporized (LPP) combustor technology for use in future civil supersonic transport (CST) aircraft engines. Cruise conditions for CST aircraft are such that combustors operate in a different parameter space than combustors for traditional subsonic aircraft. These conditions lead to c
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This project is a field support extension of Project 0-7168, 'Use of X-Ray Fluorescence (XRF) to Determine Tire Rubber Content in Asphalt Binders.' That project showed that XRF can determine tire rubber content accurately. This project was to provide field support to districts to conduct XRF for tire rubber content in the field and a project site,
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The purpose of this research project, conducted by the Texas A&M Transportation Institute, was to update and refine the mix design procedures for FDR to improve consistency, reliability, and performance of rehabilitated pavements. The project aimed to address the gaps and variability in current practices by suggesting certain changes to the standar
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The study commenced with a comprehensive review of the existing literature combined with a questionnaire survey that focused on the evaluation of prevailing automated pavement condition data collection techniques. The primary objective was to identify potential strategies for enhancing data quality and operational efficiency, drawing insights from
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The goals of this project were to analyze and validate TSD data for use at the project and network levels, and to provide recommendations on ways to incorporate TSD data into existing Texas Department of Transportation (TxDOT) pavement management systems. Researchers proposed procedures that use TSD structural data to enhance network- and project-l
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This study evaluated and developed machine learning models for pavement surface classification to enhance accuracy and reliability using advanced computational techniques. Initially, a detailed literature review on pavement texture and measurement methods provided a foundation for developing a prototype system. This system, integrating laser scanne
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