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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 281 - 300 of 36841 results
  • Barrier Striping for the Reduction of Accidents
    Barrier Striping for the Reduction of Accidents
    Kutela, Boniphace ;
    Geedipally, Srinivas
    2026-02-01 | PDF
    Barrier striping is a roadway safety countermeasure designed to enhance driver awareness of concrete barriers, particularly under adverse weather and low-visibility conditions. This study evaluated the short- and long-term safety effectiveness of retroreflective barrier striping across multiple sites in Texas. The research involved a comprehensive ...
  • Best Practices for Pavement Widening
    Best Practices for Pavement Widening
    Wilson, Bryan ;
    Goehl, Darlene
    2026-02-01 | PDF
    Premature pavement failures have occurred on several widening projects, including shoulder widenings, conversion of two-lane roadways to Super 2 sections, and other safety enhancements. Repairing these early failures is time-consuming, expensive, disrupts traffic, and poses safety hazards. Key contributing factors include poor-quality materials, po ...
  • Evaluating Alternative Fuels for SnowplowMaintenance Vehicles and Identifying Barriers to Adoption
    Evaluating Alternative Fuels for Snowplow/Maintenance Vehicles and Identifying Barriers to Adoption
    Hallmark, Shauna ;
    Mumtarin, Maroa
    2026-02-01 | PDF
    Biodiesel is a sustainable fuel for use in any diesel engine and can be adopted in varying blends from 5% biodiesel (B5) to 100% biodiesel (B100). Blends up to B20 can be used in most diesel engines with minor or no modifications. For biodiesel blends greater than 20%, advanced technologies can be integrated into existing vehicles to ensure compati ...
  • Evaluating Alternative Fuels for SnowplowMaintenance Vehicles and Identifying Barriers to Adoption Tech Transfer Summary
    Evaluating Alternative Fuels for Snowplow/Maintenance Vehicles and Identifying Barriers to Adoption [Tech Transfer Summary]
    Hallmark, Shauna
    ORCID ICON IMG
    2026-02-01 | PDF
    The objective of this research was to conduct an independent evaluation of the impact of adopting a 100% biodiesel blend (B100) on the performance of the Iowa Department of Transportation (Iowa DOT) snowplow fleet, including impacts on fuel economy, maintenance, carbon reduction, and driver/maintenance personnel concerns.
  • Evaluation of Greenhouse Gas Emissions Reductions Due to Vermonts Clean Transportation Incentive Programs
    Evaluation of Greenhouse Gas Emissions Reductions Due to Vermont’s Clean Transportation Incentive Programs
    Hinchman, Hallie ;
    Pezeshknejad, Parsa
    2026-02-01 | PDF
    This study evaluates four of Vermont’s recent clean transportation incentive programs in terms of emissions reductions, cost effectiveness, and equity. We evaluate the New PEV, Replace Your Ride, MileageSmart, and eBike programs overall and for variations in the types of vehicles incentivized. The four programs evaluated achieved GHG emission reduc ...
    Supporting Files
  • Bond Performance of Posttensioning Tendons with Corrosion Inhibitor
    Bond Performance of Post-tensioning Tendons with Corrosion Inhibitor
    Consolazio, Gary R. ;
    Hamilton, H. R. (Trey)
    2026-02-01 | PDF
    Corrosion of steel tendons in post-tensioned bridge girders can lead to section loss and, if left unaddressed, may result in strand rupture and a corresponding reduction in girder strength. In the state of Florida, a number of remedial measures have been explored and implemented to address such issues, including the use of corrosion inhibitors to m ...
  • Special Crash Investigations Remote Frontover Incident Investigation Vehicle 2022 Honda Civic Location California Incident Date March 2023
    Special Crash Investigations: Remote Frontover Incident Investigation; Vehicle: 2022 Honda Civic; Location: California; Incident Date: March 2023
    Dynamic Science, Inc.
    2026-02-01 | Special Crash Investigations | PDF
    This Special Crash Investigations report documents the remote investigation of a frontover incident in California in March 2023 that involved two pedestrians, a 62-year-old male and 60-year-old female, who were struck by a 2022 Honda Civic driven by an unlicensed, belted 18-year-old male. The Honda was stopped at a traffic signal in the right turn ...
  • Safety of Median Openings on HighSpeed Highways in Louisiana Project Capsule
    Safety of Median Openings on High-Speed Highways in Louisiana [Project Capsule]
    Mitran, Elisabeta ;
    Hassan, Hany
    2026-02-01 | PDF
    The primary goal of this research is to apply a systemic, corridor-level safety analysis within a Safe System framework to identify recurring crash patterns and risk factors related to median openings on high-speed highways (i.e., roads with posted speeds of 45 mph or higher) in Louisiana. This will facilitate the data-driven identification of corr ...
  • Report 26R40 ShortTerm Field Evaluation of SprayOn Rejuvenators for Asphalt Pavement Preservation Research Project Brief
    Report 26-R40: Short-Term Field Evaluation of Spray-On Rejuvenators for Asphalt Pavement Preservation [Research Project Brief]
    Boz, Ilker ;
    Turochy, Elizabeth
    2026-02-01 | PDF
    Research Objectives: Evaluate the feasibility of applying spray-on rejuvenators under Virginia conditions; Assess short-term field performance and near-surface material response; Document constructability considerations; Develop and refine a special provision to guide future applications.
  • Characterization of Sediment Loads and Size Distribution in Nebraska Roadway Runoff
    Characterization of Sediment Loads and Size Distribution in Nebraska Roadway Runoff
    Dvorak, Bruce I. ;
    Admiraal, David M.
    2026-02-01 | PDF
    The Nebraska Department of Transportation (NDOT) must manage sediment, and pollutant loads from roadway runoff to meet stormwater regulations. The SAFL Baffle, a hydrodynamic separator used by NDOT, depends on reliable estimates of total suspended solids (TSS) and particle size distribution (PSD). However, limited data exists for Nebraska roadways. ...
  • Spatial and Temporal Load Distribution in Steel Bridge Superstructures Vol I Agency Survey and Preliminary Numerical Modeling of Skewed Steel IGirder Bridges for Field Instrumentation
    Spatial and Temporal Load Distribution in Steel Bridge Superstructures (Vol. I): Agency Survey and Preliminary Numerical Modeling of Skewed Steel I-Girder Bridges for Field Instrumentation
    Zhou, Siang ;
    Dorado, Ricardo
    2026-02-01 | PDF
    Highly skewed steel I-girder bridges are used commonly across the US, especially in congested areas, despite complications in their analysis, design, and construction. Systematic investigation of skewed steel I-girder superstructure response, load distribution, and deformation through field monitoring and numerical simulation is needed, including a ...
  • The Impacts of Minimum Parking Requirements A Research Synthesis
    The Impacts of Minimum Parking Requirements: A Research Synthesis
    Schwartz, Ellen ;
    Manville, Michael
    2026-02-01 | PDF
    Across the United States and around the world, cities are increasingly reconsidering, and often repealing, minimum parking requirements. They are doing so to align their parking policy with their housing, climate, and mobility goals. While minimums can help increase parking availability and prevent curb parking from becoming overcrowded, they can a ...
  • Durability of RapidSetting Concrete Repairs on Pavement Panels and Bridge Decks in Utah
    Durability of Rapid-Setting Concrete Repairs on Pavement Panels and Bridge Decks in Utah
    Guthrie, W. Spencer ;
    Burdette, Steven B.
    2026-02-01 | PDF
    The objective of this research was to evaluate the durability of rapid-setting concrete batched using volumetric concrete mixers and placed in a cold region. The scope of work included field and laboratory evaluations of rapid-setting concrete repairs on both pavement panels and bridge decks in Utah. Six sites in northern Utah were selected by Utah ...
  • Cold Reclamation and Recycling Techniques to Achieve Perpetual Pavements
    Cold Reclamation and Recycling Techniques to Achieve Perpetual Pavements
    Sabouri, Mohammadreza ;
    Wegman, Daniel E.
    2026-02-01 | PDF
    This study evaluates Cold In-place Recycling (CIR) for developing sustainable and cost-effective perpetual pavements. As part of the 2022 NRRA construction, four test sections were constructed at the MnROAD mainline section to utilize CIR and additionally assess the effects of incorporating rejuvenator in cold recycled asphalt materials. Two sectio ...
    Supporting Files
  • Protection of Precious Waters From Road Salt Mitigation Through Roadside Ditch Capture
    Protection of Precious Waters From Road Salt: Mitigation Through Roadside Ditch Capture
    Druschel, Stephen J.
    2026-02-01 | PDF
    Roadway deicers are essential to the functioning of daily life in northern states in winter. After plowing, roadway salting is currently the most practical way of making safe transportation possible in winter. However, road deicer chloride (salt) has a severe negative effect on surrounding watersheds. Yet, currently no methods or procedures have be ...
  • Understanding Causes of Concrete Culvert Pipe Joint Separation
    Understanding Causes of Concrete Culvert Pipe Joint Separation
    Hedegaard, Brock D. ;
    Carranza-Torres, Carlos
    2026-02-01 | PDF
    Joint separations affect approximately 20% of the Minnesota concrete pipe inventory (Taylor and Marr 2012). The goals of this research are to determine the factors that contribute to joint separation and recommend practices to mitigate this problem. Research efforts follow a three-pronged approach: (1) Examination of TAMS HydInfra database; (2) fie ...
  • National Accessibility Evaluation Phase II
    National Accessibility Evaluation: Phase II
    Lind, Eric M. ;
    Owen, Andrew
    2026-02-01 | PDF
    This project implements activities for the National Accessibility Evaluation (NAE) pooled-fund study, performing accessibility evaluations describing conditions in 2020, 2021, 2022, 2023, and 2024. The National Accessibility Evaluation creates national census block-level accessibility datasets that can be used by partners in local transportation sy ...
  • Standardized Framework for Winter Weather Road Condition Indices
    Standardized Framework for Winter Weather Road Condition Indices
    Nlenanya, Inya ;
    Sassani, Alireza
    2026-02-01 | PDF
    State and local agencies across the United States have developed winter weather road condition indices (WWRCIs) to support decisions related to roadway operations, public information, road closures, and winter maintenance responses based on prevailing conditions. However, the absence of a standardized national framework for WWRCIs has resulted in s ...
  • Implementing the Safe System Approach for Speed Management in Utah
    Implementing the Safe System Approach for Speed Management in Utah
    Schultz, Grant G. ;
    Tripp, Kezia I.
    2026-02-01 | PDF
    Speed management is central to reducing fatal and serious injury crashes. The Safe System Approach, an emerging roadway safety paradigm in the United States, recognizes human error and vulnerability and focuses on minimizing crash severity through coordinated policy, design, and operational strategies. This research examines how Safe System Approac ...
  • Navigating Possibilities Unlocking Tennessees Waterways for Interstate Freight Transportation
    Navigating Possibilities: Unlocking Tennessee's Waterways for Interstate Freight Transportation
    Maier, Donald ;
    Trombly, Jeffrey
    2026-02-01 | PDF
    The study evaluated the inland waterways and port facilities of the State and analyzed their potential for transportation services as part of the overall State Transportation plan. The focus of the study evaluated the current flows and costs of cargo movement and commodity class; the path related to origin and destination; the viability of potentia ...
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