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US Transportation Collection

rosaP Repository & Open Science Access Portal

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 61 - 80 of 35753 results
  • 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 ...
  • 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 ...
  • Special Crash Investigations Onsite Ambulance Crash Investigation Vehicle 2011 Chevrolet Silverado 3500 Type III Ambulance Location Pennsylvania Crash Date November 2022
    Special Crash Investigations: On-site Ambulance Crash Investigation; Vehicle: 2011 Chevrolet Silverado 3500 Type III Ambulance; Location: Pennsylvania; Crash Date: November 2022
    Crash Research & Analysis, Inc
    2025-11-01 | PDF
    This Special Crash Investigations report documents the on-site investigation of the fatal crash of a 2011 Chevrolet Silverado 3500 Type III ambulance, a 2017 Toyota RAV4, and a 2009 Infiniti G37X in Pennsylvania in 2022. The ambulance entered a four-way intersection and struck the Toyota, a traffic-control pole, and a tree. After the impact with th ...
  • Special Crash Investigations Onsite Ambulance Rollover Crash Investigation 2019 Ford E350 Type III Ambulance Location North Carolina Crash Date January 2022
    Special Crash Investigations: On-site Ambulance Rollover Crash Investigation; 2019 Ford E350 Type III Ambulance; Location: North Carolina; Crash Date: January 2022
    Crash Research & Analysis, Inc
    2025-11-01 | PDF
    This Special Crash Investigations report documents the fatal rollover crash of a 2019 Ford E-350 Type III ambulance in North Carolina in 2022. The ambulance was transporting a patient with a heart condition without lights or sirens when it hit a patch of ice, skidded off the road and went down an embankment, and rollover. When the 84-year-old patie ...
  • 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 ...
  • 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 ...
  • Modeling Travel Time Reliability for NonInterstate National Highway System Routes
    Modeling Travel Time Reliability for Non-Interstate National Highway System Routes
    Zhao, Mo ;
    Lan, Chien-Lun
    2025-11-01 | PDF
    Under the Moving Ahead for Progress in the 21st Century Act, state departments of transportation are required to report travel time reliability and set performance targets for interstate and non-interstate National Highway System facilities. Although several Virginia Transportation Research Council studies have analyzed and predicted travel time re ...
  • NHTSA Crash Investigation Sampling System Event Data Recorder Data Element Benchmarking Study
    NHTSA Crash Investigation Sampling System Event Data Recorder Data Element Benchmarking Study
    Wiacek, Christopher J ;
    Firey, Lauren M L
    2025-11-01 | PDF
    An event data recorder records vehicle data just prior or during a crash (braking, air bag status and deployment, seat belt usage, etc., and then crash events), intended for retrieval after the crash to help crash reconstruction or vehicle safety research. NHTSA established CDR requirements in 49 C.F.R. § 563 in 2012. Since then, crash avoidance an ...
  • 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 ...
  • 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 | XLSX
    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
  • 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 ...
  • 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 ...
  • Remote Bridge Health Monitoring for Scouring Using CostEfficient Sensing Technology
    Remote Bridge Health Monitoring for Scouring Using Cost-Efficient Sensing Technology
    Yee, Tien ;
    Yang, Jidong J.
    2025-11-01 | PDF
    Bridge scour is a leading cause of hydraulic-related bridge failures, yet current monitoring practices rely on periodic inspections that are insufficient during floods when scour activity accelerates. To address this gap, a low-cost (under $1,000 per unit) remote scour-monitoring system was developed and deployed on two scour critical bridges in Ge ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Augmented Information in the Driving Environment Increasing Pedestrian Safety with Augmented Reality Indicators for Older Adult Drivers in Maine
    Augmented Information in the Driving Environment: Increasing Pedestrian Safety with Augmented Reality Indicators for Older Adult Drivers in Maine
    Brown, Justin R. ;
    Fink, Paul D. S.
    2025-10-31 | PDF
    This report describes the project activities conducted at The University of Maine’s VEMI Lab to address the increasing rate of vehicle-pedestrian collisions within the state of Maine and to improve older adult driving safety. Leveraging VEMI’s experience with virtual reality environments, human-subject research, and the lab’s fully immersive autono ...
  • Develop Methodologies for Reducing Costs in Full Depth Reclamation FDR Project Summary Report
    Develop Methodologies for Reducing Costs in Full Depth Reclamation (FDR) [Project Summary Report]
    Sebesta, Stephen ;
    Kim, Jinho
    2025-10-31 | PDF
    Researchers collected materials from five districts and produced laboratory FDR mixtures using emulsified and foamed asphalt, with and without additive. Researchers performed tests for indirect tensile strength, resilient modulus, unconfined compressive strength, and permanent deformation to evaluate strength and performance-related properties over ...
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