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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 421 - 440 of 36841 results
  • Enhancing ADOT Communications to Reduce Highway Litter in Arizona
    Enhancing ADOT Communications to Reduce Highway Litter in Arizona
    Washburn, Lauren C. ;
    O’Callaghan, Nicholas
    2025-11-04 | PDF
    This report summarizes a statewide study commissioned by the Arizona Department of Transportation (ADOT) to inform and enhance anti-litter communications and operational litter remediation practices as they pertain to the Arizona state highway system. The project team conducted communications research, developed a highway visible litter characteriz ...
  • Evaluating the Virginia Department of Transportations Potential Use of Electric Pickup Trucks Using Field Test Data supplemental file
    Evaluating the Virginia Department of Transportation’s Potential Use of Electric Pickup Trucks Using Field Test Data [supplemental file]
    Virginia Transportation Research Council (VTRC)
    2025-11-01 | EXCEL
    This Excel Spreadsheet contains the Electric Vehicle Decision Support Tool: The life cycle cost analysis tool allows for a life cycle cost analysis comparison of multiple vehicles, including electric vehicles (EV), hybrid electric vehicles (HEV), and internal combustion engine vehicles (ICEV). The tool requires inputs about how the vehicle will be ...
    Supporting Files
  • Development of a Design Methodology for Geosynthetic Reinforced Pavement Using Finite Element Numerical Modeling
    Development of a Design Methodology for Geosynthetic Reinforced Pavement Using Finite Element Numerical Modeling
    Abu-Farsakh, Murad Y. ;
    Zadehmohamad, Mehdi
    2025-11-01 | PDF
    This study was completed using finite element (FE) analysis to assess the benefits of using geosynthetic reinforcement in flexible pavements. A comprehensive parametric study was performed to determine the effect of different variables like asphalt layer thickness, base thickness, geosynthetic type and stiffness, and subgrade stiffness for low, med ...
  • Alternatives to Motor Fuel Taxes for State DOT Funding
    Alternatives to Motor Fuel Taxes for State DOT Funding
    Dunn, Travis P ;
    Alvarado, Roberto
    2025-11-01 | PDF
    For decades, motor fuel taxes have served as the primary source of revenue for surface transportation infrastructure at both the federal and state levels in the United States. However, the reliability of this funding mechanism is challenged by declining fuel consumption, driven by advancements in vehicle engine efficiency and the growing consumer s ...
  • Structural Monitoring of Steel Member Bridge with Fatigue Life Prognosis Due to Dynamic Vehicular Loads
    Structural Monitoring of Steel Member Bridge with Fatigue Life Prognosis Due to Dynamic Vehicular Loads
    Wang, Yang ;
    Sherman, Ryan J.
    2025-11-01 | PDF
    A critical durability factor for steel bridges is the long-term fatigue performance, which depends on the structure’s fatigue details, stress range, and cycle counts. Modern bridges account for these factors and have an infinite service life; however, bridges designed using previous fatigue provisions may experience cracking. Given the importance o ...
  • Extending Full Depth Reclamation Service Lives
    Extending Full Depth Reclamation Service Lives
    Amarh, Eugene A. ;
    Tong, Bilin
    2025-11-01 | PDF
    The Virginia Department of Transportation (VDOT) has successfully used in-place recycling strategies on approximately 40 pavement rehabilitation projects in the state during the past decade. One such technique, full-depth reclamation (FDR), is usually selected as an alternative to conventional reconstruction to rehabilitate failing pavements where ...
  • Research Study to Inform StrutandTie Design and Guidance
    Research Study to Inform Strut-and-Tie Design and Guidance
    Tuchscherer, Robin G. ;
    Dymond, Benjamin Z.
    2025-11-01 | PDF
    The goal of the project summarized in this report was to research and develop criteria for updating and improving the ADOT Bridge Design Guidelines with respect to the strut-and-tie methodology defined in the AASHTO LRFD Bridge Design Specifications. To accomplish this goal, the existing literature was reviewed and bridge engineers in Arizona and a ...
  • Life History and Landscape Factors Influencing the Choice of Avoidance Minimization and Mitigation Measures Aimed at Reducing Impacts to the Rusty Patched Bumblebee Bombus affinis in Transportation Corridors
    Life History and Landscape Factors Influencing the Choice of Avoidance, Minimization, and Mitigation Measures Aimed at Reducing Impacts to the Rusty Patched Bumblebee (Bombus affinis) in Transportation Corridors
    Robinson, Jason L. ;
    Piltz, Moshe M.
    2025-11-01 | PDF
    The federally endangered rusty patched bumblebee (Bombus affinis) provides a difficult set of challenges for management and conservation. Bumblebee species have complex life histories, interacting with different obligatory habitat requirements across the ontogeny of the colony. Transportation corridors present unique opportunities for interventions ...
  • Determination of Immediate Claystone Scour Potential
    Determination of Immediate Claystone Scour Potential
    Stelwagon, Kate ;
    Senseney, Christopher T
    2025-11-01 | PDF
    The leading cause of bridge failure globally is scour. Scour occurs when water flowing beneath a bridge excavates and carries away portions of the streambed. Traditional scour prediction methodologies were designed for course-grained or “cohesionless” materials. Different scour mechanisms exist for course-grained and fine-grained materials. This st ...
  • Development of a Design Methodology for Geosynthetic Reinforced Pavement Using Finite Element Numerical Modeling Technical Summary
    Development of a Design Methodology for Geosynthetic Reinforced Pavement Using Finite Element Numerical Modeling [Technical Summary]
    Abu-Farsakh, Murad Y.
    2025-11-01 | PDF
    This study was completed using finite element (FE) analysis to assess the benefits of using geosynthetic reinforcement in flexible pavements. A comprehensive parametric study was performed to determine the effect of different variables like asphalt layer thickness, base thickness, geosynthetic type and stiffness, and subgrade stiffness for low, med ...
  • Piloting Smart Work Zone Technologies to Provide RealTime Lane Closure Information to Improve Oregon Highway Safety and Mobility
    Piloting Smart Work Zone Technologies to Provide Real-Time Lane Closure Information to Improve Oregon Highway Safety and Mobility
    Wang, Haizhong ;
    Li, Xiugang
    2025-11-01 | PDF
    This study presents the results and implementation strategies on the deployment of smart work zone equipment. A smart arrow board in combination with location beacons were tested towards understanding best practices, both informed by the test pilot and through a literature review, on the inclusion of such devices within work zones in Oregon. Furthe ...
  • Ruggedness Study of Specimen Preparation and FineTuning of Test Methods for IDTCT and IDTHT Test
    Ruggedness Study of Specimen Preparation and Fine-Tuning of Test Methods for IDT-CT and IDT-HT Test
    Boz, Ilker ;
    Habbouche, Jhony
    2025-11-01 | PDF
    The Virginia Department of Transportation utilizes the indirect tensile cracking test (IDT-CT) and the indirect tensile at high temperature (IDT-HT) test as part of its balanced mix design framework to evaluate asphalt mixture performance and support performance-based acceptance decisions. Although these tests are critical tools for assessing perfo ...
  • Alternatives to Motor Fuel Taxes for State DOT Funding Technical Summary
    Alternatives to Motor Fuel Taxes for State DOT Funding [Technical Summary]
    Dunn, Travis P
    2025-11-01 | PDF
    For decades, motor fuel taxes have served as the primary source of revenue for surface transportation infrastructure at both the federal and state levels in the United States. However, the reliability of this funding mechanism is challenged by declining fuel consumption, driven by advancements in vehicle engine efficiency and the growing consumer s ...
  • Determination of Immediate Claystone Scour Potential Research Brief
    Determination of Immediate Claystone Scour Potential [Research Brief]
    Senseney, Christopher T. ;
    Stelwagon, Kathryn L.
    2025-11-01 | PDF
    The purpose of this study was to determine the immediate scour of un-weathered claystone bedrock in bridge configurations, i.e., around piers and/or constricted flow. This study evaluated the erodibility of un-weathered claystone found in the Colorado Front Range with the SRICOS-EFA (Scour Rate in Cohesive Soils – Erosion Function Apparatus) method ...
  • Field Validation of Balanced Mix Design Initial Criteria
    Field Validation of Balanced Mix Design Initial Criteria
    Diefenderfer, Stacey D. ;
    Boz, Ilker
    2025-11-01 | PDF
    The Virginia Department of Transportation (VDOT) initiated efforts to implement balanced mix design (BMD) in 2017, using 11 mixtures from a well-documented previous study in a benchmarking effort to select performance-related tests to use within the BMD framework and develop criteria for those tests. When these mixtures were produced and paved in 2 ...
  • Reconnecting Communities Recommendations for Caltrans Excess Land
    Reconnecting Communities: Recommendations for Caltrans Excess Land
    Butler, Tamika L. ;
    Ullmann, Leila
    2025-11-01 | PDF
    What changes to policies and procedures at the California Department of Transportation (Caltrans) would increase transfers of agency-owned excess land to California Native American Tribes and groups negatively impacted by freeway development? Using case studies on LandBack and reparations and qualitative research with Caltrans staff and community a ...
  • Evaluating the Virginia Department of Transportations Potential Use of Electric Pickup Trucks Using Field Test Data
    Evaluating the Virginia Department of Transportation’s Potential Use of Electric Pickup Trucks Using Field Test Data
    Goodall, Noah J. ;
    Robartes, Erin M
    2025-11-01 | PDF
    In December 2022, the Virginia Transportation Research Council completed the technical assistance report, Potential for Electrification of the VDOT Vehicle Fleet, which investigated how electric trucks might integrate into the Virginia Department of Transportation’s (VDOT) fleet. That study was based on daily mileages of a sample of VDOT’s current ...
  • Project Delivery DesignBuild Guidance
    Project Delivery Design-Build Guidance
    Sullivan, Kenneth T. ;
    Grau, David
    2025-11-01 | PDF
    This report benchmarks Design-Build (DB) and Progressive Design-Build (PDB) practices across 17 U.S. transportation agencies to inform Arizona DOT’s alternative-delivery program. It analyzes statutory provisions, DB manuals, and interviews with project stakeholders to document notable practices in cost control, risk allocation, training, DBE inclus ...
  • State of The Practice of a Data Management Office Within DOTs
    State of The Practice of a Data Management Office Within DOTs
    Shang, Mingfeng ;
    Wu, Yao-Jan
    2025-11-01 | PDF
    The Arizona Department of Transportation (ADOT) is evaluating the feasibility of establishing a data management office (DMO) to enhance the accessibility, quality, and coordination of its data assets. As data grows in volume and strategic importance, transportation agencies nationwide have adopted formal structures to improve data governance. This ...
  • Modeling Concrete Pavement to Assess Buckling Risk
    Modeling Concrete Pavement to Assess Buckling Risk
    Hernandez, Jaime ;
    Underwood, B. Shane
    2025-11-01 | PDF
    This project developed a validated mechanistic model and an Excel-based tool to predict buckling risk in jointed concrete pavements. The three-dimensional finite element model, built in Abaqus, simulates thermal buckling by capturing slab-joint-base-subgrade interactions. Joints were modeled using connector elements, and the slab-base interface use ...
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