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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.

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Showing 1301 - 1320 of 36873 results
  • Evaluating Sedimentation Impacts to Freshwater Mussels Research Summary
    Evaluating Sedimentation Impacts to Freshwater Mussels [Research Summary]
    Baolin, Deng
    2024-09-01 | PDF
    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 ...
  • LowShrinkage UltraHighPerformance Concrete Summary
    Low-Shrinkage Ultra-High-Performance Concrete [Summary]
    Aljawad, Yasmeen ;
    Lequesne, Remy D.
    2024-09-01 | PDF
    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 ...
  • LowShrinkage UltraHighPerformance Concrete
    Low-Shrinkage Ultra-High-Performance Concrete
    Aljawad, Yasmeen ;
    Lequesne, Remy D.
    2024-09-01 | PDF
    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 ...
  • Traffic Safety Facts 2022 Data Summary of Motor Vehicle Traffic Crashes
    Traffic Safety Facts 2022 Data: Summary of Motor Vehicle Traffic Crashes
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-09-01 | PDF
    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 ...
  • Traffic Safety Facts 2022 Data State Traffic Data
    Traffic Safety Facts 2022 Data: State Traffic Data
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-09-01 | PDF
    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 ...
  • OSTR Research Roundup September 2024
    OST-R Research Roundup: September 2024
    United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology
    2024-09-01 | OST-R Research Roundup | PDF
    News from across OST-R and its research community.
  • Effectiveness of Automated Pavement Restriping Systems Phase I Cost Comparison Between Manual and Automated Systems Summary
    Effectiveness of Automated Pavement Restriping Systems, Phase I: Cost Comparison Between Manual and Automated Systems [Summary]
    Schrock, Steven D. ;
    Liu, Lanxi
    2024-09-01 | PDF
    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 ...
  • Motorcycle Helmet Use in 2023 Overall Results Traffic Safety Facts Research Note
    Motorcycle Helmet Use in 2023 – Overall Results [Traffic Safety Facts - Research Note]
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-09-01 | PDF
    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 ...
  • Traffic Safety Facts CrashStats Early Estimate of Motor Vehicle Traffic Fatalities for the First Half JanuaryJune of 2024
    Traffic Safety Facts Crash-Stats: Early Estimate of Motor Vehicle Traffic Fatalities for the First Half (January–June) of 2024
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-09-01 | PDF
    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 ...
  • Use of Titanium Alloy Reinforcement to Strengthened Bridges in Alabama Laboratory Testing and Analytical Investigations
    Use of Titanium Alloy Reinforcement to Strengthened Bridges in Alabama: Laboratory Testing and Analytical Investigations
    Islam, Md Aminul ;
    Flowers, Jack C
    2024-09-01 | PDF
    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 ...
  • Bridge Deck Thermography Verification and Policy
    Bridge Deck Thermography Verification and Policy
    Seston, Brady ;
    Tieso, Anthony
    2024-09-01 | PDF
    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 ...
  • Project 074 Low Emissions Premixed Combustion Technology for Supersonic Civil Transport
    Project 074 Low Emissions Premixed Combustion Technology for Supersonic Civil Transport
    Steinberg, Adam
    2024-09-01 | PDF
    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 ...
  • Robust DecisionMaking Framework for Sustainable Operations and Planning of MBTA Rapid Transit Vehicles
    Robust Decision-Making Framework for Sustainable Operations and Planning of MBTA Rapid Transit Vehicles
    Han, Zhuo ;
    Christofa, Eleni
    2024-09-01 | PDF
    Urban Rail Transit (URT) systems play a critical role in modern cities but consume significant amounts of energy. Understanding and predicting energy consumption patterns in these systems is vital for sustainable urban planning, especially during disruptive events. This study presents a Long Short-Term Memory (LSTM) recurrent neural network, the mo ...
  • Measuring the Impact of Roadside Features on RoadDeparture Crashes and Prioritizing Safety Improvement Projects
    Measuring the Impact of Roadside Features on Road-Departure Crashes and Prioritizing Safety Improvement Projects
    Subedi, Abhishek Kumar ;
    Markovic, Nikola
    2024-09-01 | PDF
    This study investigated the impact of roadside features on road departure (RD) crashes and provided recommendations for safety improvements on Utah's highways. The research utilized a computer vision model originally developed in the UDOT project, Automated Safety Assessment of Rural Roadways Using Computer Vision (Mashhadi et al., 2023), which was ...
  • Understanding AI Risks in Transportation AI Assurance for Transportation Whitepaper Series
    Understanding AI Risks in Transportation: AI Assurance for Transportation Whitepaper Series
    United States. Department of Transportation. Highly Automated Systems Safety Center of Excellence
    2024-09-01 | PDF
    Our first AI Assurance (AIA) whitepaper, An Overview of AI Assurance for Transportation, was published in April 2024. One of the identified key areas for AIA research is AI risk assessment and mitigation, which has not been explored sufficiently in the past. To promote and accelerate research efforts to address AI risks, this whitepaper-as the seco ...
  • FargoMoorhead Metro Traffic Data Collection and Reporting Phase II
    Fargo-Moorhead Metro Traffic Data Collection and Reporting - Phase II
    Sharma, Kshitij
    2024-09-01 | PDF
    For the current Phase II project, 42 additional intersections were set up for data collection and analysis, bringing the total area locations reporting data to more than 70 (considering those from NDDOT as well). The intersections for each agency are listed in tables below. Note again that similar to the pilot project, this phase of traffic data co ...
  • 0716801 Support XRF Determination of Tire Rubber Content in Asphalt Binders
    0-7168-01: Support XRF Determination of Tire Rubber Content in Asphalt Binders
    Bhasin, Amit ;
    Filonzi, Angelo
    2024-08-31 | PDF
    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, ...
  • Develop Laboratory Mix Design for Full Depth Reclamation FDR Projects Using Foamed Asphalt Binder and Emulsified Asphalt Project Summary Report
    Develop Laboratory Mix Design for Full Depth Reclamation (FDR) Projects Using Foamed Asphalt Binder and Emulsified Asphalt [Project Summary Report]
    Arambula-Mercado, Edith ;
    Sebesta, Stephen
    2024-08-31 | PDF
    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 ...
  • Improve Data Quality for Automated Pavement Distress Data Collection Project Summary Report
    Improve Data Quality for Automated Pavement Distress Data Collection [Project Summary Report]
    Wang, Feng ;
    Luo, Xiaohua
    2024-08-31 | PDF
    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 ...
  • Determine the Feasibility and Methodologies of Using Structural Data from the Traffic Speed Deflectometer in Network and ProjectLevel Treatment Decision Making Project Summary Report
    Determine the Feasibility and Methodologies of Using Structural Data from the Traffic Speed Deflectometer in Network- and Project-Level Treatment Decision Making [Project Summary Report]
    Scullion, Tom ;
    Dorsett, Garrett
    2024-08-31 | PDF
    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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