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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 35478 results
  • Improved Detailing in Steel Bridges to Prevent ConstraintInduced Fracture
    Improved Detailing in Steel Bridges to Prevent Constraint-Induced Fracture
    Bennett, Caroline ;
    Collins, William N
    2025-12-19 | PDF
    This report describes an investigation focused on characterizing the phenomenon of constraint-induced fracture (CIF) in steel bridges, specifically considering three classes of details which prior research has not adequately addressed: thick bearing stiffeners, connection plates, and orthogonal stiffeners with varying constraint-relief gap dimensio ...
  • 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 ...
  • 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- ...
  • 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 ...
  • Overview of the 2024 Crash Investigation Sampling System Traffic Safety Facts
    Overview of the 2024 Crash Investigation Sampling System [Traffic Safety Facts]
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2025-12-01 | PDF
    In 2024 NHTSA increased data collection sites from 32 to 40 for the 2024 Crash Investigation Sampling System (CISS). It also expanded the scope of data collection and investigated crashes involving nonmotorists. The 2024 CISS shows an estimated 2,879,549 police-reported motor vehicle crashes nationwide, representing the CISS target population of cr ...
  • Nonmotorist Crashes in the 2024 Crash Investigation Sampling System Traffic Safety Facts
    Nonmotorist Crashes in the 2024 Crash Investigation Sampling System [Traffic Safety Facts]
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2025-12-01 | PDF
    In 2024 NHTSA began upgrading the Crash Investigation Sampling System (CISS) with provisions in the Infrastructure Investment and Jobs Act (IIJA), which said “to enhance the collection of crash data by upgrading the [CISS] to include – 1) additional data collection sites; 2) an expanded scope that includes all crash types; and 3) on-scene investiga ...
  • 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 ...
  • 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 ...
  • Investigation of Dolomite Aggregate LongTerm Cementation and Its Potential Advantage for Building Roads
    Investigation of Dolomite Aggregate Long-Term Cementation and Its Potential Advantage for Building Roads
    Kong, Taeyun ;
    Kothari, Chirayu
    2025-12-01 | PDF
    This study investigated the mechanical strength and freeze-thaw durability of carbonate-based aggregate quarry by-products (QBs) stabilized with cement alone and in combination with calcined clay (metakaolin, MK) for potential use in pavement foundation layers. The primary objective was to evaluate the chemical and physical characteristics of dolom ...
  • A Path Forward for Transit Rider Experience and Safety Lessons from the LA Metro Ambassador Pilot Program
    A Path Forward for Transit Rider Experience and Safety: Lessons from the LA Metro Ambassador Pilot Program
    Wasserman, Jacob L. ;
    Brozen, Madeline
    2025-12-01 | PDF
    A growing number of U.S. transit agencies are adding transit ambassadors to their systems to improve the customer service and safety experience for passengers. These personnel can play a variety of different roles, including providing wayfinding, system navigation, fare payment support, and other passenger support roles that enhance the customer ex ...
  • Reliability of Nondestructive Evaluation of Concrete Bridge Decks
    Reliability of Nondestructive Evaluation of Concrete Bridge Decks
    Balakumaran, Soundar S G ;
    Behravan, Amir
    2025-12-01 | PDF
    Although visual inspections remain the primary method for bridge deck evaluation, they fail to detect hidden deterioration. Rapid-scanning nondestructive evaluation (NDE) techniques are gaining popularity, but their reliability compared with traditional methods is unclear. This study aimed to determine the reliability of multiple NDE methods for de ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
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