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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 81 - 100 of 36022 results
  • Kansas Department of Transportation 2025 Passing Lane Guidance Technical Summary
    Kansas Department of Transportation 2025 Passing Lane Guidance [Technical Summary]
    Fitzsimmons, Eric J. ;
    Harwood, Douglas
    2025-12-01 | PDF
    This report provides comprehensive guidance for planning, locating, designing, and evaluating passing lanes on Kansas rural two-lane highways. It describes the role of passing in improving mobility by reducing platooning, lowering percent time spent following, and increasing travel speeds. Multiple passing lane configurations are outlined, with gui ...
  • Standardizing Rigid Inclusions for Transportation ProjectsPhase I Technical Summary
    Standardizing Rigid Inclusions for Transportation Projects—Phase I [Technical Summary]
    Han, Jie ;
    Lamsal, Sameep
    2025-12-01 | PDF
    Evaluation of the design methods involved a comparison of results calculated from the popular design methods BS 8006-1, EBGEO, CUR226, and the Federal Highway Administration (FHWA) for three key design parameters (load efficacy, differential settlement and reinforcement strain). The measured data were available in the literature, including 24 full- ...
  • Standardizing Rigid Inclusions for Transportation Projects Phase I
    Standardizing Rigid Inclusions for Transportation Projects — Phase I
    Han, Jie ;
    Lamsal, Sameep
    2025-12-01 | PDF
    Rigid inclusions (RIs) have increasingly been used in ground improvement technology in the United States because they effectively reduce settlement, increase bearing capacity, and enhance stability. Several design methods have been developed to analyze RI-supported embankments based on various assumptions for transportation applications. This study ...
  • Traffic Control Device Analysis Testing and Evaluation Program FY 2025 Activities
    Traffic Control Device Analysis, Testing, and Evaluation Program: FY 2025 Activities
    Finley, Melisa D. ;
    Lopez, Nicholas
    2025-12-01 | PDF
    Traffic control devices are a primary means of communicating highway information to road users and play a key role in highway automation. The design, application, and maintenance of traffic control devices are under constant transformation as new technologies, methodologies, and policies are introduced. In addition, vehicle technologies and the roa ...
  • Kansas Department of Transportation 2025 Passing Lane Guidance
    Kansas Department of Transportation 2025 Passing Lane Guidance
    Fitzsimmons, Eric J. ;
    Harwood, Douglas
    2025-12-01 | PDF
    This report provides comprehensive guidance for planning, locating, designing, and evaluating passing lanes on Kansas rural two-lane highways. It describes the role of passing in improving mobility by reducing platooning, lowering percent time spent following, and increasing travel speeds. Multiple passing lane configurations are outlined, with gui ...
  • 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 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- ...
  • 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 ...
  • 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 ...
  • Machine Vision Approach to Retroreflectivity Measurements
    Machine Vision Approach to Retroreflectivity Measurements
    Raj, Sumit ;
    Senske, Nickolas
    2025-12-01 | PDF
    This report presents a complete evaluation of the machine-vision-based dynamic retroreflectometer system (DRS) with a 30-m geometry scaled to 12-m, manufactured by Reflective Measurement Systems Ltd, 100% owners of RetroTekUSA. The assessment includes pavement marking evaluation, including line striping retroreflectivity, line striping width, color ...
  • 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 ...
  • A Computational Tool for the Reliable Prediction of Pavement Performance based on Temperature Data
    A Computational Tool for the Reliable Prediction of Pavement Performance based on Temperature Data
    dos Santos, Ketson ;
    Marasteanu, Mihai O.
    2025-12-01 | PDF
    This study presents a computational tool for predicting pavement performance using long-term temperature data from thermocouple trees embedded in three flexible and two rigid pavement sections at the MnROAD facility. The research leverages spectral and probabilistic analyses to assess thermal behavior and its impact on pavement condition. Temperatu ...
  • Bismarck Mandan Regional ITS Architecture Update Version 50
    Bismarck- Mandan Regional ITS Architecture Update [Version 5.0]
    Hasan, Sharijad
    2025-12-01 | PDF
    The Bismarck-Mandan Regional Intelligent Transportation Systems (ITS) Architecture was developed under the guidance of the Bismarck-Mandan Metropolitan Planning Organization (Bis-Man MPO). Initially created in 2005, this architecture has undergone four updates in 2008, 2013, 2021, and 2025. Its primary purpose is to guide the implementation of ITS ...
  • 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 ...
  • 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 fo ...
  • 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 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 ...
  • 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 ...
  • Reducing Costs in Full Depth Reclamation
    Reducing Costs in Full Depth Reclamation
    Kim, Jinho ;
    Sebesta, Stephen
    2025-12-01 | PDF
    Full depth reclamation (FDR) using emulsified asphalt or foamed asphalt continues to grow in usage throughout Texas. These mixtures typically use a cement additive in the mix design. The cement additive reportedly contributes to early strength gain, which can be particularly important for projects that require daily opening to heavy traffic. Howeve ...
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