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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 561 - 580 of 36841 results
  • Synthesis Commercial AirCoupled Ground Penetrating Radar Systems to Be Used for Pavement Evaluations in Texas Project Summary Report
    Synthesis: Commercial Air-Coupled Ground Penetrating Radar Systems to Be Used for Pavement Evaluations in Texas [Project Summary Report]
    Ham, Suyun ;
    Ryu, Kyeong Rok
    2025-08-31 | PDF
    TxDOT initiated this project to identify and recommend a modern, vehicle-mounted air-coupled GPR system that better aligns with current and future pavement evaluation needs. The objective was to evaluate commercially available GPR systems in terms of technical performance, compatibility with existing workflows, long-term cost-effectiveness, and eas ...
  • Develop a RealTime Decision Support Tool for Urban Roadway Safety Improvements Project Summary Report
    Develop a Real-Time Decision Support Tool for Urban Roadway Safety Improvements [Project Summary Report]
    Das, Subasish ;
    Wu, Lingtao
    2025-08-31 | PDF
    The researchers undertook three major tasks to achieve the project’s objectives. In the first task, they focused on data conflation, integrating multiple data sources such as real-time traffic speed and volume data from the National Performance Management Research Data Set (NPMRDS), crash data from the Crash Records Information System (CRIS), weath ...
  • Evaluation of Advanced Security Systems for Caltrans Equipment YardsMaintenance Stations
    Evaluation of Advanced Security Systems for Caltrans Equipment Yards/Maintenance Stations
    Sisi, Saeid Delshad ;
    Lasky, Ty
    2025-08-31 | PDF
    The Advanced Highway Maintenance and Construction Technology (AHMCT) Research Center surveyed the security landscape (mobile robot security guards, video analytics security) to determine the current state of the art, and identify a system suited to DOE's security situation. The researchers provided information to the project panel supporting lease ...
  • Determine Effectiveness of Construction Management Plans CMPs Project Summary Report
    Determine Effectiveness of Construction Management Plans (CMPs) [Project Summary Report]
    Caldas, Carlos ;
    Han, Zhe
    2025-08-31 | PDF
    The study began with a detailed review of CMP content and structure to identify standardized elements and key characteristics of CMP projects, including conflict categorization and quantification. Using the compiled data, the team analyzed trends in change orders before and after CMP implementation to assess their impact on project performance, par ...
  • Feasibility Study of Unmanned Aerial Vehicle Imagery for Mapping Roadside Milkweeds and Nectaring Plants for the Monarch Butterfly
    Feasibility Study of Unmanned Aerial Vehicle Imagery for Mapping Roadside Milkweeds and Nectaring Plants for the Monarch Butterfly
    Pringle, Elizabeth ;
    Dilts, Tom
    2025-08-31 | PDF
    In this project, we sought to couple two imaging technologies, drones and vehicle-mounted cameras, with models using artificial intelligence to predict the location of milkweed plants in Northern Nevada. Milkweeds are weedy plants that frequently occur along roadsides, and they are the only food used by caterpillars of the monarch butterfly, whose ...
  • Evaluation of the Effect of Integral Waterproofing Agents Admixtures on Surface Resistivity Measurements Project Capsule
    Evaluation of the Effect of Integral Waterproofing Agents (Admixtures) on Surface Resistivity Measurements [Project Capsule]
    Hungria, Ricardo ;
    Rupnow, Tyson
    2025-08-27 | PDF
    The objectives of this study are to: 1. Determine the effect of incorporating waterproofing admixtures on the surface resistivity of concrete; and 2. Determine if the different admixture dosages can be optimized.
  • Youth Cruz Free: Fare Free Bus and Ridership Behavior among Santa Cruz County Teens [supporting dataset]
    Pike, Susan ;
    Affolter, Bailey
    2025-08-25 | ZIP
    Since the beginning of the twenty-first century, young people have become a considerable share of public transit users. However, younger representatives of this age group still face many barriers to access transit infrastructure and benefit from its service. This study examines a Youth Cruz Free program launched by the Santa Cruz METRO in March 202 ...
    Dataset
  • Illinois Highway Materials Sustainability Efforts 2024
    Illinois Highway Materials Sustainability Efforts 2024
    Senger, Kelly
    2025-08-25 | PDF
    The Illinois Department of Transportation (IDOT) continues to use a variety of reclaimed and recycled materials in highway construction. Recycled materials are used in highway construction to supplement aggregates, concrete, hot-mix asphalt (HMA), steel, and sealants, as well as for soil modification and pavement markings. This report summarizes th ...
  • Study on the Permissible Depth of Utilities Under the MSE Walls and Means and Methods of Protecting the MSE Walls When the Permissible Depth Cannot Be Provided
    Study on the Permissible Depth of Utilities Under the MSE Walls and Means and Methods of Protecting the MSE Walls When the Permissible Depth Cannot Be Provided
    Ahmad, Md Asad ;
    Bobet, Antonio
    2025-08-20 | PDF
    Mechanically Stabilized Earth (MSE) walls may intersect utilities such as pipes and culverts, which may be located within the reinforced backfill or foundation soil. Evidence from previous failures has shown that leakage or collapse of these utilities can lead to severe deformation or loss of wall integrity. Despite the critical implications of pip ...
  • Evaluation of Unmanned Surface Vessel USV Technology for Bathymetric Surveying of Inland Environments
    Evaluation of Unmanned Surface Vessel (USV) Technology for Bathymetric Surveying of Inland Environments
    Wolek, Artur ;
    Nikonowicz, Alex
    2025-08-18 | PDF
    This research project aimed to improve NCDOT’s capabilities in collecting high-quality bathymetric survey data using unmanned surface vessels (USVs), focusing on evaluating current technologies, supporting their adoption by NCDOT, and tailoring tools and workflows to NCDOT’s specific use cases. A comprehensive literature review was conducted to ass ...
  • Communication of Fixed and Mobile Warnings to Commercial Trucks Using InCab Notification
    Communication of Fixed and Mobile Warnings to Commercial Trucks Using In-Cab Notification
    Desai, Jairaj ;
    Sakhare, Rahul Suryakant
    2025-08-15 | PDF
    Improving commercial vehicle safety continues to be an important priority for all stakeholders. There has been considerable focus in Indiana on reducing work zone related crashes, particularly those involving commercial motor vehicles encountering unexpected slowdowns or stopped traffic on the interstate. Connected vehicle data have the potential t ...
  • Streamlining Permitting and Mitigation Processes to Improve SCDOT Project Delivery
    Streamlining Permitting and Mitigation Processes to Improve SCDOT Project Delivery
    Huynh, Nathan N. ;
    Wang, Jing
    2025-08-08 | PDF
    The South Carolina Department of Transportation (SCDOT) identified three areas that have significant effect on its ability to deliver projects on time and on budget: (1) inconsistent permit application submittals among consultants that led to delay in approval by the U.S. Army Corp of Engineers, (2) inability to consistently identify “red flags” ea ...
  • Investigation of Low Friction on Asphalt Pavements
    Investigation of Low Friction on Asphalt Pavements
    Bao, Jieyi ;
    Peng, Cheng
    2025-08-08 | PDF
    This study explores low-friction issues in specific asphalt pavements utilizing dolomite aggregates within an Indiana Department of Transportation district. It examines the frictional characteristics of these aggregates, concentrating on initial friction (PSV0) and long-term friction retention (PSV10). Employing a mix of laboratory tests, field dat ...
  • Modeling the Dynamic Modulus of Asphalt Mixtures Using SingleValue Test Results Phase III Development of LowTemperature HighFrequency Relations
    Modeling the Dynamic Modulus of Asphalt Mixtures Using Single-Value Test Results, Phase III: Development of Low-Temperature, High-Frequency Relations
    Fieldkircher, Beatriz ;
    Adejube, Jeremiah
    2025-08-01 | PDF
    This research developed a practical method to relate UDOT’s existing material tests for asphalt mixtures, including the Bending Beam Rheometer (BBR) for low-temperature behavior and the IDEAL-CT for intermediate-temperature cracking, to the dynamic modulus (E*) master curve required for Level 1 inputs in AASHTOWare Pavement ME®. The proposed approa ...
  • Performance Evaluation of Safe Mobility for Life Coalitions Outreach Activities to Benefit Aging Road Users Summary
    Performance Evaluation of Safe Mobility for Life Coalition’s Outreach Activities to Benefit Aging Road Users [Summary]
    Alluri, Priyanka ;
    Mdimi, Odilo
    2025-08-01 | PDF
    As Florida’s aging population increases, the demand to ensure safe mobility for older adults also increases, especially since aging road users are vulnerable to serious and fatal crashes. Over 20% of Florida residents are aged 65 or older, and this number is projected to increase by 2045. Age is linked with a decline in vision, cognition, and react ...
  • Use of Innovative Recycling Agents for Improving the Sustainability and Durability of Asphalt Pavement
    Use of Innovative Recycling Agents for Improving the Sustainability and Durability of Asphalt Pavement
    Mohammad, Louay N. ;
    Elnaml, Ibrahim
    2025-08-01 | PDF
    The use of reclaimed asphalt pavement (RAP) as a partial replacement for virgin aggregates and asphalt binders has received considerable attention in recent years due to its economic and environmental benefits. These benefits include a potential reduction in asphalt mixture cost and the promotion of sustainability. However, many state Departments o ...
  • Traffic Control Device Analysis Testing and Evaluation Program FY 2024 Activities
    Traffic Control Device Analysis, Testing, and Evaluation Program: FY 2024 Activities
    Finley, Melisa D. ;
    Brewer, Marcus A.
    2025-08-01 | PDF
    Traffic control devices are a primary means of communicating highway information to road users and play a key role in highway automation. The design, application, and maintenance of traffic control devices are under constant transformation as new technologies, methodologies, and policies are introduced. In addition, vehicle technologies and the roa ...
  • Detecting Endangered Turtles with Environmental DNA Research Summary
    Detecting Endangered Turtles with Environmental DNA [Research Summary]
    Davis, Mark ;
    Smith, Christopher
    2025-08-01 | PDF
    This Research summary is part of Report 2025-25, "Assessing a New Tool for Early Detection of Endangered Turtles on Proposed Transportation Projects."
  • Assessment of HighwayRailroad Grade Crossing Strategies Countermeasures and Technologies to Improve Traffic Safety and Mobility in Florida Summary
    Assessment of Highway-Railroad Grade Crossing Strategies, Countermeasures, and Technologies to Improve Traffic Safety and Mobility in Florida [Summary]
    Lin, Pei-Sung
    2025-08-01 | PDF
    Highway-rail grade crossings (HRGCs) are conflict areas for trains and road users, which present a significant safety concern in Florida. The HRGCs not only affect safety but also have a significant impact on traffic operations. FDOT explored several strategies to improve safety and mobility related to railroad grade crossings, including signage, p ...
  • MechanisticBased Evaluation of Performance Thresholds for Balanced Mix Design Asphalt Surface Mixtures
    Mechanistic-Based Evaluation of Performance Thresholds for Balanced Mix Design Asphalt Surface Mixtures
    Habbouche, Jhony ;
    Boz, Ilker
    2025-08-01 | PDF
    As part of the Virginia Department of Transportation (VDOT) balanced mix design (BMD) implementation process, VDOT selected three quick, simple, and practical empirical tests to evaluate asphalt mixtures against different modes of distress for design and acceptance. These tests include the Cantabro test, with a mass loss limit of 7.5%; the indirect ...
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