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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 1 - 20 of 35440 results
  • Special Crash Investigations OnSite Rollover System Crash Investigation Vehicle 2019 Subaru Outback Limited Location North Carolina Crash Date November 2022
    Special Crash Investigations: On-Site Rollover System Crash Investigation; Vehicle: 2019 Subaru Outback Limited; Location: North Carolina; Crash Date: November 2022
    Crash Research & Analysis, Inc
    2025-12-01 | PDF
    This Special Crash Investigations report documents the on-site investigation of the rollover crash of a 2019 Subaru Outback Limited in North Carolina in November 2022 driven by a belted 34-year-old female with a belted 70-year-old female front passenger. The Subaru crossed into the oncoming lane, traveling more than half a mile before veering off t ...
  • Special Crash Investigations OnSite Rollover Crash Investigation Vehicle 2019 Chevrolet Equinox Location California Crash Date October 2022
    Special Crash Investigations: On-Site Rollover Crash Investigation; Vehicle: 2019 Chevrolet Equinox; Location: California; Crash Date: October 2022
    Dynamic Science, Inc.
    2025-12-01 | PDF
    This Special Crash Investigations report documents the fatal rollover crash of a 2019 Chevrolet Equinox that moved into the lane of a 2016 Honda CR-V. The Chevrolet went out of control, rolled down a dirt embankment and rolled over. The Chevrolet driver was pronounced deceased on-scene and the belted 52-year-old front passenger was hospitalized for ...
  • Early Estimate of Motor Vehicle Traffic Fatalities for The First 9 Months JanuarySeptember of 2025 Traffic Safety Facts
    Early Estimate of Motor Vehicle Traffic Fatalities for The First 9 Months (January–September) of 2025 [Traffic Safety Facts]
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2025-12-01 | PDF
    A statistical projection of traffic fatalities for the first 9 months of 2025 shows an estimated 27,365 people died in motor vehicle traffic crashes, a decrease of about 6.4 percent compared to the first 9 months of 2024, as shown in Table 1. The third quarter of 2025 represents the 14th consecutive quarterly decline in fatalities beginning with th ...
  • 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 ...
  • Traffic Safety Facts Crash Stats Early Estimates of Motor Vehicle Traffic Fatalities and Fatality Rate by SubCategories For the First Half JanuaryJune of 2025
    Traffic Safety Facts Crash Stats: Early Estimates of Motor Vehicle Traffic Fatalities and Fatality Rate by Sub-Categories For the First Half (January-June) of 2025
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2025-11-01 | PDF
    NHTSA recently issued a projection report of traffic fatalities and the fatality rate per 100 million vehicle miles traveled (VMT) for the first half of 2025 (Report No. DOT HS 813 756) that showed an estimated 17,140 people died in motor vehicle traffic crashes during the first half of 2025, a decrease of about 8.2 percent as compared to 18,680 fa ...
  • Traffic Safety Facts Crash Stats Seat Belt Use in 2024 Use Rates in the States and Territories
    Traffic Safety Facts Crash Stats: Seat Belt Use in 2024 – Use Rates in the States and Territories
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2025-11-01 | PDF
    This edition of Traffic Safety Facts Crash•Stats lists the most current data on the nationwide seat belt use rate in 2024 as calculated by probability-based observational surveys conducted by the 50 States, the District of Columbia, and U.S. Territories. In 2024 seat belt use in the United States ranged from 71.0 percent in the U.S. Virgin Islands ...
  • 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 ...
  • 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
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
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