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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 101 - 120 of 36841 results
  • LongTerm Implications of Redecking Bridges With Prestressed Concrete Girders Technical Summary
    Long-Term Implications of Redecking Bridges With Prestressed Concrete Girders [Technical Summary]
    Adhikari, Beeva ;
    Lequesne, Rémy D.
    2026-06-01 | PDF
    The objective of this study was to build a model to assess the effects of removing and replacing a damaged concrete deck over prestressed concrete girders. The main research tasks included the following:• Review the literature on the deck removal process, prestressed concrete girders, prestress losses, and long-term deformations in concrete.• Surve ...
  • Performance of Jointless Bridges in Virginia
    Performance of Jointless Bridges in Virginia
    Kassner, Bernard L. ;
    Hoppe, Edward J.
    2026-06-01 | PDF
    Since the early 1980s, the Virginia Department of Transportation (VDOT) has routinely developed and modified bridge abutment designs that eliminate the need for deck joints. The main objective is to decrease lifecycle maintenance costs and disruptions to the traveling public while constructing resilient structures across Virginia. VDOT's current po ...
  • LiDAR for Geotechnical Applications
    LiDAR for Geotechnical Applications
    Gautreau, Gavin P. ;
    Nobahar, Masoud
    2026-06-01 | PDF
    This research focused on the utilization of Light Detection and Ranging (LiDAR) technology within the Louisiana Department of Transportation and Development (DOTD) for various geotechnical applications. The study addressed several key practices, including site investigation and reconnaissance for drilling operations, geotechnical asset management i ...
  • The Effect of Nighttime Lighting on Construction Workers Safety
    The Effect of Nighttime Lighting on Construction Workers’ Safety
    Ho, Chun-Hsing ;
    Kim, Kyungki
    2026-06-01 | PDF
    This research evaluated the effectiveness of nighttime construction lighting systems in improving worker visibility and safety while minimizing glare impacts on motorists in Nebraska work zones. The study combined an industry survey with controlled field testing to assess current lighting practices and quantify lighting performance. Survey response ...
  • Development of Safety Performance Functions for Urban and Suburban Multilane Highways in Georgia
    Development of Safety Performance Functions for Urban and Suburban Multilane Highways in Georgia
    Yang, Jidong J. ;
    Liu, Jun
    2026-06-01 | PDF
    This report presents the findings of the Georgia Department of Transportation (GDOT) Research Project 25-04 which concludes Research Project 22-27, which aimed to develop Georgia-specific safety performance functions (SPFs) and estimate crash modification factors (CMFs) to evaluate the safety effectiveness of different median treatments on urban an ...
  • Dissimilar Metal Welds Between ASTM A709 Grade 50CR and Other Bridge Steels
    Dissimilar Metal Welds Between ASTM A709 Grade 50CR and Other Bridge Steels
    Provines, Jason T. ;
    Behravan, Amir
    2026-06-01 | PDF
    Corrosion is a prevailing cause of bridge deterioration for the Virginia Department of Transportation (VDOT) and leads to expensive maintenance actions. During the past decade, ASTM A709 Grade 50CR steel has been used on bridges to provide additional corrosion resistance, although its higher material and fabrication costs present implementation cha ...
  • Effect of Bridge Deck Placement Sequences on Cracking Performance
    Effect of Bridge Deck Placement Sequences on Cracking Performance
    Arce, Gabriel A. ;
    Ozyildirim, Celik
    2026-06-01 | PDF
    Uncertainty persists regarding the influence of continuous deck placement on cracking performance. This study evaluates the effect of bridge deck placement sequence-that is, continuous versus sequential (checkerboard)-through a literature review, a survey of state departments of transportation and Virginia Department of Transportation (VDOT) distri ...
  • Analyzing and Predicting Truck Travel Time Reliability
    Analyzing and Predicting Truck Travel Time Reliability
    Zhao, Mo ;
    Appiah, Justice
    2026-06-01 | PDF
    Truck travel time reliability (TTTR) is one of the most important performance measures for assessing freight movement on the interstates. The Virginia Department of Transportation (VDOT) and the Virginia Office of Intermodal Planning and Investment have been reporting TTTR and setting performance targets as required by the Federal Highway Administr ...
  • Report 26R51 Analyzing and Predicting Truck Travel Time Reliability Research Project Brief
    Report 26-R51: Analyzing and Predicting Truck Travel Time Reliability [Research Project Brief]
    Zhao, Mo ;
    Appiah, Justice
    2026-06-01 | PDF
    The study analyzed 2019-2025 National Performance Management Research Data Set truck travel time data for 1,743 interstate segments alongside traffic, roadway, crash, incident, and weather information. Three modeling approaches were tested: a hierarchical Bayesian model, random forest models for each period analyzed (AM peak, midday, PM peak, overn ...
  • PEDAT A Pedestrian Data Platform
    PEDAT: A Pedestrian Data Platform
    Singleton, Patrick A. ;
    Rafe, Amir
    2026-06-01 | PDF
    The objective of this work was to develop a robust pedestrian data (PEDAT) platform-built upon high-resolution traffic signal data and research relating push-button data to pedestrian volumes-that can be used to monitor pedestrian activity and provide pedestrian data for a variety of tasks in planning, design, operations, and management. Following ...
  • A Peer Evaluation of Safety at Signalized Intersections in Utah
    A Peer Evaluation of Safety at Signalized Intersections in Utah
    Schultz, Grant G. ;
    Stutts, Auzton
    2026-06-01 | PDF
    The Utah Department of Transportation (UDOT) has made significant efforts to reduce crashes at signalized intersections and is constantly seeking to improve safety across the state. The purpose of this research is to quantify and evaluate the safety rates and frequencies at signalized intersections in Utah compared to other states. Once the crashes ...
  • What to Expect When Youre Expecting Passenger Rail How Central Valley Communities Are Preparing for HighSpeed Rail Research Brief
    What to Expect When You're Expecting Passenger Rail: How Central Valley Communities Are Preparing for High-Speed Rail [Research Brief]
    Hazelton-Boyle, Josephine K. ;
    Bick, Naomi
    2026-06-01 | PDF
    Imagine a brand-new transportation system connecting places in ways they have never connected before. Now imagine you have to gain political approval from diverse and polarized groups and local governments to build this system. This is exactly the task the state of California set for itself in constructing the High-Speed Rail (HSR). The current pro ...
  • Evaluation of Existing Transportation Demand Management Calculators
    Evaluation of Existing Transportation Demand Management Calculators
    Scheib, Walter ;
    Kilpatrick, Ian
    2026-06-01 | PDF
    The Colorado Department of Transportation (CDOT) supports the use of Transportation Demand Management (TDM) strategies to reduce greenhouse gas emissions (GHG) and maximize transportation investments implemented at the state and local levels. This report represents initial research that will inform potential development of a CDOT TDM Calculator. Sp ...
  • Evaluating the Interaction of the Transit System on Vulnerable Road User Safety in Utah
    Evaluating the Interaction of the Transit System on Vulnerable Road User Safety in Utah
    Schultz, Grant G. ;
    Stevens, Becky
    2026-06-01 | PDF
    The general safety of vulnerable road users (VRUs) has been shown by some researchers to decrease in the vicinity of transit stops. Previous studies have shown correlations between pedestrian-vehicle crashes and pedestrian generators, specifically transit stops. Furthermore, previous researchers have identified a discrepancy between declining crash ...
  • Track Allocation in Indian Railways Institutional Design Departmental Incentives and the Allocation of Scarce Track Time
    Track Allocation in Indian Railways - Institutional Design, Departmental Incentives, and the Allocation of Scarce Track Time
    Shukla, Utsav
    2026-06-01 | PDF
    This capstone examines how Indian Railways allocates scarce track time between train operations and track maintenance. The same track that carries passenger and freight trains must also be made available for inspection, repair, and renewal. The study asks how institutional design and departmental incentives shape this allocation, and what changes c ...
  • Routes to Sustainable Goods Movement How Local and Regional Governmental Agencies Can Plan for the Sustainable Freight System of the Future Research Brief
    Routes to Sustainable Goods Movement: How Local and Regional Governmental Agencies Can Plan for the Sustainable Freight System of the Future [Research Brief]
    Alexander, Serena ;
    Grady, Avante
    2026-06-01 | PDF
    This research examines how metropolitan regions across the U.S. are planning for sustainable freight transportation. The study analyzes freight plans from eight major metropolitan regions and interviews freight professionals to identify common strategies, implementation approaches, emerging trends, and persistent barriers. The goal is to provide lo ...
  • Evaluation of LowTemperature Cracking LTC Performance Testing Methods to Assess Nebraska Asphalt Mixtures
    Evaluation of Low-Temperature Cracking (LTC) Performance Testing Methods to Assess Nebraska Asphalt Mixtures
    Bastola, Nitish R. ;
    Teixeira, Jamilla E. S. L.
    2026-06-01 | PDF
    Current advancements in asphalt mixture design in the United States are increasingly shifting toward performance-based specifications, particularly through implementation of the Balanced Mix Design (BMD) framework. However, most existing BMD protocols primarily emphasize rutting and mid-temperature cracking resistance, often overlooking low-tempera ...
  • Improved Signalized Intersection Performance Using Computer Vision and Artificial Intelligence
    Improved Signalized Intersection Performance Using Computer Vision and Artificial Intelligence
    Moomen, Milhan ;
    Meng, Xiangyu
    2026-06-01 | PDF
    Signalized intersections are critical points in urban transportation networks where congestion, delays, and safety risks are most prominent. Traditional approaches for performance evaluation rely on manual field counts, loop detectors, or expensive infrastructure-based systems, which are often limited in accuracy, scalability, and adaptability. Thi ...
  • Routes to Sustainable Goods Movement How Local and Regional Governmental Agencies Can Plan for the Sustainable Freight System of the Future
    Routes to Sustainable Goods Movement: How Local and Regional Governmental Agencies Can Plan for the Sustainable Freight System of the Future
    Alexander, Serena ;
    Grady, Avante
    2026-06-01 | PDF
    Freight transportation plays a critical role in supporting economic activity and everyday consumption across metropolitan regions, but growing freight demand continues to increase congestion, infrastructure strain, greenhouse gas emissions, air pollution, and safety risks. These impacts often disproportionately affect low-income and environmentally ...
  • What to Expect When Youre Expecting Passenger Rail How Central Valley Communities Are Preparing for HighSpeed Rail
    What to Expect When You're Expecting Passenger Rail: How Central Valley Communities Are Preparing for High-Speed Rail
    Hazelton-Boyle, Josephine K. ;
    Bick, Naomi
    2026-06-01 | PDF
    Approved by California voters in 2008, the California High-Speed Rail (CAHSR) project is a planned 800-mile rail corridor across California aimed at delivering intercity passenger rail service to the state's largest metropolitan areas. This was the first voter-approved high-speed rail project in the United States and remains one of its most content ...
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