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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 41 - 60 of 35753 results
  • 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 fo ...
  • 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 ...
  • NHTSA Field Crash Investigation 2024 Coding and Editing Manual
    NHTSA Field Crash Investigation 2024 Coding and Editing Manual
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2025-12-01 | PDF
    NHTSA’s field crash investigation-based data collection programs are the Crash Investigation Sampling System (CISS), Special Crash Investigations (SCI), and the Crash Injury Research & Engineering Network (CIREN). The CISS builds on the long running National Automotive Sampling System Crashworthiness Data System (NASS CDS). The NHTSA investigation- ...
  • Crash Investigation Sampling System 2024 Analytical Users Manual
    Crash Investigation Sampling System 2024 Analytical User’s Manual
    Radja, Gregory A ;
    Noh, Eun Young
    2025-12-01 | PDF
    The Crash Investigation Sampling System is a national traffic crash database of comprehensive traffic crash data on police-reported motor vehicle crashes in the United States during the year involving passenger cars, light trucks, and light vans that were towed. Non-motorist crashes were added in 2024 to the crashes researched by CISS. This manual ...
  • NHTSA Field Crash Investigation 2024 Nonmotorist Coding and Editing Manual
    NHTSA Field Crash Investigation 2024 Nonmotorist Coding and Editing Manual
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2025-12-01 | PDF
    NHTSA’s field crash investigation-based data collection programs use the Crash Investigation Sampling System (CISS), Special Crash Investigations (SCI), and the Crash Injury Research & Engineering Network (CIREN) to collect detailed crash data to help scientists and engineers analyze motor vehicle crashes and injuries. CISS collects data on a repre ...
  • Special Crash Investigations Remote MoveOverLaw Crash Investigation Vehicle 2016 Chevrolet Silverado 2500 Location Washington Crash Date May 2021
    Special Crash Investigations: Remote Move-Over-Law Crash Investigation; Vehicle: 2016 Chevrolet Silverado 2500; Location: Washington; Crash Date: May 2021
    Dynamic Science, Inc.
    2025-12-01 | PDF
    This Special Crash Investigations report documents the remote investigation of a crash in May 2021, during which a 2008 Toyota Sienna struck a 2016 Chevrolet Silverado 2500 pickup truck used by the Washington State Department of Transportation (WSDOT) incident response team while aiding in a prior crash. The state’s Move-Over-Law requires drivers t ...
  • Special Crash Investigations Remote MoveOverLaw Crash Investigation Vehicle 2020 Ford F150 Location Utah Crash Date April 2022
    Special Crash Investigations: Remote Move-Over-Law Crash Investigation; Vehicle: 2020 Ford F-150; Location: Utah; Crash Date: April 2022
    Dynamic Science, Inc.
    2025-12-01 | PDF
    This Special Crash Investigations report documents the remote investigation of a crash selected NHTSA includes in its Move-Over-Law investigations. The pre-dawn crash in April 2022 in Utah occurred when a 2014 Kenworth tractor pulling a refrigerated trailer rear-ended a stopped deputy sheriff’s vehicle, a 2020 Ford F-150. Two deputy sheriffs in the ...
  • Determining the Impact of CDOT Roadway Construction Projects on Air Quality
    Determining the Impact of CDOT Roadway Construction Projects on Air Quality
    Coffey, Evan ;
    Cortez, Gabriela
    2025-12-01 | PDF
    Elevated concentrations of air pollutants can have serious impacts on human health, the environment, and Colorado’s ecosystems. The Colorado Department of Transportation (CDOT) has prioritized protecting air quality in accordance with the Colorado Air Pollution Prevention and Control Act (Section 25-7-101 et seq., C.R.S., 2017). This research quant ...
  • Develop a Methodology for Pavement Drainage System Rating
    Develop a Methodology for Pavement Drainage System Rating
    Chen, Qiming ;
    Liu, Jun
    2025-12-01 | PDF
    Effective drainage is critical for preserving pavement integrity and extending service life, yet network-level methods for evaluating pavement drainage conditions remain limited. This study presents a practical methodology for assessing pavement drainage conditions using data from the Louisiana Department of Transportation and Development’s (DOTD) ...
  • Marketing and Education Budget for Implementation of New Transit Technology Report
    Marketing and Education Budget for Implementation of New Transit Technology [Report]
    Ketterl, Mona ;
    Dutta, Utpal
    2025-11-30 | PDF
    Michigan’s public transit agencies face increasing challenges in adopting new technologies due to limited funding, staffing constraints, and varying technical capacity. The purpose of this project was to identify practical strategies to support the planning, marketing, and implementation of new transit technologies across Michigan. The research met ...
  • Marketing and Education Budget for Implementation of New Transit Technology Guidebook
    Marketing and Education Budget for Implementation of New Transit Technology [Guidebook]
    Ketterl, Mona ;
    Dutta, Utpal
    2025-11-30 | PDF
    Michigan’s public transit agencies face increasing challenges in adopting new technologies due to limited funding, staffing constraints, and varying technical capacity. The purpose of this project was to identify practical strategies to support the planning, marketing, and implementation of new transit technologies across Michigan. The research met ...
  • Framework and Methodology for RiskBased Bridge and Tunnel Asset Management RiskBased Asset Ranking and Corridor Prioritization
    Framework and Methodology for Risk-Based Bridge and Tunnel Asset Management: Risk-Based Asset Ranking and Corridor Prioritization
    Yang, David Y. ;
    Khosravifar, Arash
    2025-11-10 | PDF
    This report presents the results of Phase II of the project, "Framework and Methodology for Risk-based Bridge and Tunnel Asset Management". The research was carried out at Portland State University in collaboration with engineers and officials at the Oregon Department of Transportation (ODOT) and Federal Highway Administration (FHWA). Using the fra ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
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