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.
United States. Department of Transportation. National Highway Traffic Safety Administration
2025-12-01
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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-
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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
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United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
2025-12-01
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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
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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
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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
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This report covers analyses of Caltrans’ near-fault adjustment factors as recommended in the Caltrans Seismic Design Criteria. The report has two large chapters. Chapter 1 builds on prior the University of California Los Angeles studies that performed probabilistic seismic hazard analyses at numerous California sites across a range of return period
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This project spanning the year 2025 set up 17 additional City intersections, raising the total locations reporting data to 19. Note that similar to the NDDOT sponsored pilot project, this phase of traffic data collection and reporting used existing infrastructure without the need to purchase or maintain any additional traffic data collection device
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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
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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)
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United States. Department of Transportation. National Highway Traffic Safety Administration
2025-12-01
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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
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United States. Department of Transportation. National Highway Traffic Safety Administration
2025-12-01
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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
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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
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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
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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
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United States. Department of Transportation. National Highway Traffic Safety Administration
2025-12-01
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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
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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
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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
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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
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Concrete pavements constitute only about 2% of Alabama’s highway system, yet they provide durable and low-maintenance performance capable of handling heavy traffic and environmental challenges. The Alabama Department of Transportation (ALDOT) currently utilizes the AASHTO 1993 design guide, which, while reliable, often produces conservative and ove
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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
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