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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 201 - 220 of 36569 results
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Benchmarking Computer VisionBased Approaches To Derive EngineeringOriented Condition From Existing UDOT Assets Data
    Benchmarking Computer Vision-Based Approaches To Derive Engineering-Oriented Condition From Existing UDOT Assets Data
    Pandey, Shailaja Ratna ;
    Esteghamati, Mohsen Zaker
    2026-02-01 | PDF
    Condition assessment of how transportation infrastructure supports safe and reliable road and highway operation. Departments of Transportation across the country rely heavily on manual inspections, which are time-consuming and costly. This study evaluated whether modern computer vision (CV) methods can support traffic sign condition assessment alon ...
  • Assessment of Winter Maintenance Performance Objectives Using Maintenance Decision Support System
    Assessment of Winter Maintenance Performance Objectives Using Maintenance Decision Support System
    Walker, Curtis L. ;
    Anderson, Mark R.
    2026-01-31 | PDF
    It is important for transportation agencies to assess their winter maintenance operations performance to identify areas for improvement and/or resource investment to maintain optimal levels of service, mobility, and safety. This study explores nine winter snowstorms in Nebraska during the 2023-2024 winter season across 20 road segments, 12 of which ...
  • Caltrans Field Trials of the Intelligent TruckMounted Attenuator ITMA
    Caltrans Field Trials of the Intelligent Truck-Mounted Attenuator (ITMA)
    Torick, Dave ;
    Kumar, Dinesh
    2026-01-30 | PDF
    Truck-mounted attenuator (TMA) operators are exposed to traffic-related hazards during Caltrans maintenance operations. To help reduce this exposure, the Advanced Highway Maintenance and Construction Technology Research Center (AHMCT), in partnership with Caltrans, conducted controlled public-road field trials of the Intelligent Truck-Mounted Atten ...
  • MultiObjective Decision Analysis and Optimization Model for Transportation Investment DecisionMaking at MDOT
    Multi-Objective Decision Analysis and Optimization Model for Transportation Investment Decision-Making at MDOT
    Robert, William ;
    Bliss, Abigail
    2026-01-29 | PDF
    Multi-objective decision analysis (MODA) provides transportation agencies with a structured process for identifying a set of investments that delivers the greatest impact toward their objectives. In the presented research, the research team developed a prototype MODA-based approach for prioritizing pavement rehabilitation and reconstruction project ...
  • The Business Case for Sustainable Road Infrastructure Development
    The Business Case for Sustainable Road Infrastructure Development
    Holguin, David ;
    Benny, Deepak
    2026-01-27 | PDF
    This study developed a business-case framework for embedding sustainability into the Indiana Department of Transportation’s (INDOT) practices. The study first identified the role of sustainability in road infrastructure development, and then discussed strategic plans, sustainability programs, and institutional challenges that shape how sustainabili ...
  • Assessment of Temperature Correction Factors for Falling Weight Deflectometer Deflections
    Assessment of Temperature Correction Factors for Falling Weight Deflectometer Deflections
    Iglesias, Pablo Orosa ;
    Li, Jin
    2026-01-16 | PDF
    This study presents the development of an improved temperature correction methodology for falling weight deflectometer (FWD) deflections in full-depth asphalt pavements. The objective was to address the limitations of existing correction methods by integrating viscoelastic pavement behavior, structural properties, and realistic thermal gradients. F ...
  • Evaluation of Rolled Erosion Control Products and Seed Mixes for Vegetation Establishment on Slopes
    Evaluation of Rolled Erosion Control Products and Seed Mixes for Vegetation Establishment on Slopes
    Donaldson, Bridget M. ;
    Rossetti, Maria S.
    2026-01-01 | PDF
    Because transportation construction projects often result in steep slopes with disturbed, bare soils that are sensitive to runoff and erosion processes, vegetation establishment is a continual challenge for transportation departments. The Virginia Department of Transportation (VDOT) regularly uses rolled erosion control products (RECPs) to mitigate ...
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