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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 121 - 140 of 36022 results
  • 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
    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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 2016 2021 Performance Monitoring of MechanisticEmpirical Designed Pavements
    2016 – 2021 Performance Monitoring of Mechanistic-Empirical Designed Pavements
    Illinois. Department of Transportation
    2025-11-01 | PDF
    The Illinois Department of Transportation (IDOT) began conducting pavement performance monitoring surveys on mechanistic-empirical designed pavements in 1986. These surveys and analyses provide the necessary data to verify and validate the design procedures and life-cycle cost models used in the pavement selection process. The pavement distress sur ...
  • 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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