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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 21 - 40 of 36569 results
  • 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 ...
  • Recycled Binder Availability of Virginia RAP Materials and Its Effects on Asphalt Mixture Composition and Performance
    Recycled Binder Availability of Virginia RAP Materials and Its Effects on Asphalt Mixture Composition and Performance
    Kuchiishi, Kazuo ;
    Boz, Ilker
    2026-06-01 | PDF
    In Virginia, most asphalt mixtures contain reclaimed asphalt pavement (RAP), which may pose some challenges regarding asphalt pavement durability if these mixtures are not properly designed. One of the concerns is the uncertainty in the amount of RAP binder that is available, active, and effectively contributing to the total asphalt content of the ...
  • Entire Interior Culvert Lining With Engineered Cementitious Composites
    Entire Interior Culvert Lining With Engineered Cementitious Composites
    Arce, Gabriel A. ;
    Sharifi, Mary
    2026-06-01 | PDF
    Corrugated metal pipes make up a significant portion of Virginia’s culvert inventory and are prone to deterioration from corrosion and abrasion, particularly at the invert. In early stages, invert rehabilitation techniques such as invert paving are sufficient. However, at advanced stages of distress, full interior repair becomes necessary. In such ...
  • Report 26R44 Entire Interior Culvert Lining With Engineered Cementitious Composites Research Project Brief
    Report 26-R44: Entire Interior Culvert Lining With Engineered Cementitious Composites [Research Project Brief]
    Arce, Gabriel A. ;
    Sharifi, Mary
    2026-06-01 | PDF
    Research Objectives: The purpose of this laboratory and parametric study was to provide VDOT with practical sprayable ECCs and improved design guidance for the trenchless rehabilitation of CMPs, particularly for applications requiring repair of the entire culvert interior using SAPL.
  • 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 ...
  • 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 ...
  • 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 ...
  • Minimum Parking Requirements Fuel Driving Issue Brief
    Minimum Parking Requirements Fuel Driving [Issue Brief]
    Schwartz, Ellen
    2026-06-01 | PDF
    High levels of driving can impose significant social costs, including traffic injuries and deaths, congestion, air and noise pollution, and health risks linked to sedentary lifestyles. Minimum parking requirements amplify these impacts by encouraging car ownership and driving - and discouraging other ways of moving around. These mandates typically ...
  • 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 ...
  • Field Evaluation of Lightweight Noise Barriers and Development of Noise Barrier Inspection and Asset Management Program
    Field Evaluation of Lightweight Noise Barriers and Development of Noise Barrier Inspection and Asset Management Program
    Provines, Jason T.
    2026-06-01 | PDF
    Noise barriers along high-volume roads reduce traffic noise using either normal-weight materials, such as concrete or brick, or lightweight materials, such as metal, composites, fiberglass, or acrylic. Although the Virginia Department of Transportation's (VDOT) current concrete noise barriers have proven durable, some lightweight metal noise barrie ...
  • 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 ...
  • Exploring the Use of VMT as an Evaluation Metric Within Virginias Transportation Planning Process
    Exploring the Use of VMT as an Evaluation Metric Within Virginia’s Transportation Planning Process
    Ohlms, Peter B. ;
    Kim, Aden
    2026-06-01 | PDF
    For several decades, transportation planners and engineers have used automobile Level of Service (LOS) to communicate transportation system conditions. In Virginia, stakeholders such as Fairfax County officials have shown interest in supplementing LOS with vehicle miles traveled (VMT), which can be a useful measure of vehicle travel and a proxy for ...
  • Report R2646 Exploring the Use of VMT as an Evaluation Metric Within Virginias Transportation Planning Process Research Project Brief
    Report R26-46: Exploring the Use of VMT as an Evaluation Metric Within Virginia’s Transportation Planning Process [Research Project Brief]
    Ohlms, Peter B. ;
    Kim, Aden
    2026-06-01 | PDF
    The purpose of this study was to explore how VMT might be used as a transportation evaluation metric in Virginia, based on reviewing how VMT has been applied elsewhere and translating such uses to the Virginia context. The research explored how widespread VMT is in the United States; at what points in Virginia’s planning process could VMT analysis ...
  • Placement Options for InStreet Pedestrian Crossing Signs
    Placement Options for In-Street Pedestrian Crossing Signs
    Kothuri, Sirisha ;
    Monsere, Chris
    2026-06-01 | PDF
    This study evaluated the effects of R1-6a pedestrian crossing signs, installed in various configurations, on driver yielding behavior at uncontrolled marked crosswalks across six Oregon locations. The research analyzed both staged and naturalistic crossings under different experimental conditions, including baseline, tubular markers, single and mul ...
  • Oregon Traffic Safety Research Roadmap
    Oregon Traffic Safety Research Roadmap
    Griffin, Greg P. ;
    Roll, Josh F.
    2026-06-01 | PDF
    To address the rising increase in fatal and serious traffic injuries, the ODOT Traffic Safety Research Roadmap establishes a structured, five-year research agenda listing research concepts for funding through ODOT Research Unit’s annual funding cycle as well as other funding opportunities. The study identifies 51 priority traffic safety research ne ...
  • WebBased Tool to Advance Geotechnical Data Interchange and ReliabilityBased Site Characterization
    Web-Based Tool to Advance Geotechnical Data Interchange and Reliability-Based Site Characterization
    Gautreau, Gavin P. ;
    Peng, Xin
    2026-06-01 | PDF
    The Louisiana Department of Transportation and Development (DOTD) continues to improve its geotechnical data management policies and expand its use of digital data for geotechnical design. New advanced data-rich techniques and methodologies have been developed for geotechnical site characterization, including those recommended by the Advanced Geote ...
  • 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 ...
  • 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
    Snow, Greg L. ;
    Schultz, Grant G.
    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 ...
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