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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 1 - 20 of 36336 results
  • Business Impacts of Access Changes
    Business Impacts of Access Changes
    Gillespie, James S. ;
    Batman, Isaiah E.
    2026-05-01 | PDF
    Some types of geometric improvements that the Virginia Department of Transportation (VDOT) has begun to build in the past two decades, such as the reduction in the number of arterial access points, the replacement of a traditional four-way intersection with a roundabout, or a restricted crossing U-turn, or left-turn prohibitions, have elicited expr ...
  • Spatial and Temporal Load Distribution in Steel Bridge Superstructures Vol II Evaluation of Skewed Steel IGirder Bridge Behavior Under Deck Placement and Live Load Through Field Monitoring and Numerical Simulation
    Spatial and Temporal Load Distribution in Steel Bridge Superstructures (Vol. II): Evaluation of Skewed Steel I-Girder Bridge Behavior Under Deck Placement and Live Load Through Field Monitoring and Numerical Simulation
    Zhou, Siang ;
    Dorado, Ricardo
    2026-05-01 | PDF
    Two skewed (around 45°) two-span continuous bridges with stub abutments or integral abutments were monitored in the field during construction and after the bridges were in service. The goal was to establish a comprehensive understanding of load distribution in skewed steel I-girder bridges and to potentially refine their analysis and design procedu ...
  • Upgrade and Performance Testing of the Benchmark Profiler and the Urban and LowSpeed Profiler
    Upgrade and Performance Testing of the Benchmark Profiler and the Urban and Low-Speed Profiler
    Karamihas, Steven M. ;
    Gilbert, Mark E.
    2026-05-01 | PDF
    This report describes upgrades to the Federal Highway Administration Benchmark Profiler (BP) and the University of Michigan Transportation Research Institute Urban and Low-Speed Profiler (ULSP) and comparison between profiles measured by the two devices. BP and ULSP measurements were compared on six pavement sections at the Illinois Certification a ...
  • Development of a New VisionEval Land Use Model and Applications to Evaluate Climate Strategies in Oregon
    Development of a New VisionEval Land Use Model and Applications to Evaluate Climate Strategies in Oregon
    Wang, Liming ;
    Gregor, Brian
    2026-05-01 | PDF
    This project upgraded the land use module for the VisionEval framework to enhance the evaluation of integrated transportation and land use policies and their impacts. The project developed a new strategic land use model utilizing NHTS and Smart Location Database data from 2011 and 2019, applying advanced statistical and machine learning methods to ...
  • InService Evaluation of Temporary Sign Support Systems Against Wind Load
    In-Service Evaluation of Temporary Sign Support Systems Against Wind Load
    Beojone, Caio V. ;
    Pallab, Nazmus S.
    2026-05-01 | PDF
    This short study analyzes the performance of multiple temporary sign support systems under windy conditions and provides recommendations to the Bureau of Safety Programs and Engineering of the Illinois Department of Transportation (IDOT). The efforts included a literature review that summarizes past studies on the use of temporary sign support syst ...
  • Traffic Safety Culture Transportation Pooled Fund Outreach Materials
    Traffic Safety Culture Transportation Pooled Fund Outreach Materials
    Green, Kelly ;
    Finley, Kari
    2026-05-01 | PDF
    This project supported the Traffic Safety Culture Transportation Pooled Fund (TSC-TPF) by developing outreach materials and a communication plan to improve the dissemination and use of research findings. Using the Improving Pedestrian Safety project as a pilot, the project team created a concise project summary, audience-specific speaking points, a ...
  • Development of a Pavement Friction Management Program
    Development of a Pavement Friction Management Program
    Hu, Run ;
    Maia, Renan Santos
    2026-05-01 | PDF
    This project aims to develop a comprehensive framework for statewide pavement friction management and safety-oriented decision-making for IDOT. The project was structured into several key tasks. First, a literature review was conducted to synthesize existing research on pavement friction measurement, friction-crash relationships, investigatory leve ...
  • Implementation of AASHTOWare Pavement ME Design Software for the Kansas Department of Transportation
    Implementation of AASHTOWare Pavement ME Design Software for the Kansas Department of Transportation
    Wu, Xingdong ;
    Gao, Ya
    2026-05-01 | PDF
    The AASHTOWare Pavement ME Design (PMED) software uses the mechanistic-empirical pavement design approach. PMED prediction models need to be calibrated to local conditions to produce accurate, reliable pavement performance predictions. Previously, multiple efforts were made to locally calibrate performance models in Kansas across various AASHTOWare ...
  • Initial Analytical Investigation of Cantilever and Butterfly Steel Overhead Sign Trusses With Respect to Remaining Fatigue Life
    Initial Analytical Investigation of Cantilever and Butterfly Steel Overhead Sign Trusses With Respect to Remaining Fatigue Life
    Al Shboul, Khalid W ;
    Rasheed, Hayder A.
    2026-05-01 | PDF
    Fatigue failure of highway sign structures due to sustained wind-loading events has been recognized in many states. In fact, the American Association of State Highway and Transportation Officials specifies that the structural component should be designed for infinite life by maintaining wind-induced stress below their constant amplitude fatigue thr ...
  • Do Cities Have Too Much Parking Brief
    Do Cities Have Too Much Parking? [Brief]
    Schwartz, Ellen
    2026-05-01 | PDF
    Urban land is a limited resource, and allocating it to infrastructure devoted to storing motor vehicles — parking — reduces the amount of space available for other priorities, including housing, economic development, and green space. This issue brief synthesizes research on the large share of land devoted to parking in urban areas, the large share ...
  • Implementation of AASHTOWare Pavement ME Design Software for the Kansas Department of Transportation Technical Summary
    Implementation of AASHTOWare Pavement ME Design Software for the Kansas Department of Transportation [Technical Summary]
    Wu, Xingdong ;
    Gao, Ya
    2026-05-01 | PDF
    This study was initiated to revise the local calibration factors for version 2.6.2, released in September 2022. Another objective was to find any significant changes between the two versions that might affect the performance prediction. Also, several issues related to input material characteristics were studied.
  • The Effect of InStream Construction Activities on Turbidity Suspended Sediment and Sediment Loads
    The Effect of In-Stream Construction Activities on Turbidity, Suspended Sediment, and Sediment Loads
    Lloyd, Lewis N. ;
    Donaldson, Bridget M.
    2026-05-01 | PDF
    Transportation construction activities involving in-stream work can mobilize sediment and elevate turbidity, which can affect sensitive aquatic species such as freshwater mussels. Although cofferdams are used to isolate construction areas and limit sediment mobilization, their installation and removal create some degree of sediment release as a res ...
  • Report 26R39 The Effect of InStream Construction Activities on Turbidity Suspended Sediment and Sediment Loads Research Project Brief
    Report 26-R39: The Effect of In-Stream Construction Activities on Turbidity, Suspended Sediment, and Sediment Loads [Research Project Brief]
    Lloyd, Lewis N. ;
    Donaldson, Bridget M.
    2026-05-01 | PDF
    This study aimed to determine the transport distances of sediment associated with the installation and removal of cofferdams. Related objectives were to (1) compare the impact of cofferdam-related construction events on sediment loads and (2) to document factors that affect recovery times and sediment loads.
  • Automated Methods for Correcting ODOTs RealTime GNSS Network for Survey and PostDisaster Recovery
    Automated Methods for Correcting ODOT’s Real-Time GNSS Network for Survey and Post-Disaster Recovery
    Simpson, Chase ;
    Ohene, William
    2026-05-01 | PDF
    The Oregon Real-Time GNSS Network (ORGN), managed by the Oregon Department of Transportation, serves as a critical backbone for high-precision positioning services across the state. However, the absence of a streamlined workflow for aligning ORGN station coordinates to the National Spatial Reference System (NSRS) has introduced challenges in consis ...
    Supporting Files
  • Expanding Adaptive Traffic Control Signal Systems A Strategic Study for Louisianas Arterial Highways Project Capsule
    Expanding Adaptive Traffic Control Signal Systems: A Strategic Study for Louisiana’s Arterial Highways [Project Capsule]
    Chauvin, Clark
    2026-05-01 | PDF
    The objective of this research project is to develop a guide for expanding, implementing, maintaining, and evaluating Adaptive Traffic Control Systems (ATCS)in Louisiana. The guide will be grounded in data driven evaluation of existing Louisiana deployments and national best practices, with a focus on practical implementation under DOTD standards a ...
  • ShortTerm Field Evaluation of SprayOn Rejuvenators for Asphalt Pavement Preservation
    Short-Term Field Evaluation of Spray-On Rejuvenators for Asphalt Pavement Preservation
    Boz, Ilker ;
    Turochy, Elizabeth
    2026-05-01 | PDF
    Spray-on rejuvenators are pavement preservation treatments intended to mitigate oxidative aging of asphalt binder in the near-surface region of asphalt pavements. Although several highway agencies have evaluated these treatments, reported performance outcomes vary, and the Virginia Department of Transportation (VDOT) has limited documented experien ...
  • Developing a Road Risk Model for Large Animal Crashes in Virginia A Safe System Approach to CostEffective Safety Improvements
    Developing a Road Risk Model for Large Animal Crashes in Virginia: A Safe System Approach to Cost-Effective Safety Improvements
    Hamilton, Ian ;
    Donaldson, Bridget M.
    2026-05-01 | PDF
    In 2020, the Virginia General Assembly enacted the Virginia Wildlife Corridor Action Plan (WCAP; Code of Virginia § 29.1579), which directed the Virginia Department of Transportation (VDOT) and other state agencies to identify wildlife corridors and areas with a high risk of wildlife-vehicle collisions to prioritize wildlife crossing projects that ...
  • Report 26R41 Developing a Road Risk Model for Large Animal Crashes in Virginia A Safe System Approach to CostEffective Safety Improvements Research Project Brief
    Report 26-R41: Developing a Road Risk Model for Large Animal Crashes in Virginia: A Safe System Approach to Cost-Effective Safety Improvements [Research Project Brief]
    Hamilton, Ian ;
    Donaldson, Bridget M.
    2026-05-01 | PDF
    The purpose of this study was to develop a predictive model to identify road segments in Virginia at high risk of white-tailed deer- or black bear-vehicle collisions. A related objective was to develop a benefit-cost methodology that complements the predictive model and supports consistent and defensible benefit-cost analyses for large animal-vehic ...
  • Pavement Markings Retroreflectivity Enhancing Traffic Safety Project Capsule
    Pavement Markings Retroreflectivity: Enhancing Traffic Safety [Project Capsule]
    Dwyer, Carmine E. ;
    Codjoe, Julius
    2026-04-13 | PDF
    The objectives of the project are to: 1. Develop cost-efficient recommendations for maintaining marking retroreflectivity at or above minimum levels on Louisiana state highways; 2. Improve understanding of pavement striping practices and material performance factors that influence the durability and long-term retroreflectivity of pavement markings; ...
  • Report R26R37 Identifying Road Segments That Bisect Predicted Movement Corridors for Small Priority Species in Virginia Research Project Brief
    Report R26-R37: Identifying Road Segments That Bisect Predicted Movement Corridors for Small Priority Species in Virginia: Research Project Brief
    Akre, Thomas ;
    Connette, Grant
    2026-04-01 | PDF
    The purpose of this study was to advance the objectives of the legislated WCAP by developing species-specific road risk models and identifying road segments that pose a high risk to small priority species. The study also highlighted potential approaches to improving road-crossing connectivity based on species-specific movement corridors and road ri ...
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