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 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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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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United States. Department of Transportation. National Highway Traffic Safety Administration
2025-12-01
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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-
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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
2025-12-01
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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
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United States. Department of Transportation. National Highway Traffic Safety Administration
2025-12-01
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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
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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
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The Model Inventory of Roadway Elements (MIRE) Fundamental Data Elements (FDEs) are a subset of roadway, intersection, and interchange data elements that support robust safety management. Federal statute requires State DOTs to collect the MIRE FDEs by September 2026. This case study presents the Vermont Agency of Transportation’s (VTrans’) approach
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The Federal Highway Administration (FHWA) originally published the Model Inventory of Roadway Elements – MIRE 1.0 guidance on a set of recommended safety data elements for State departments of transportation (DOTs) in 2010. These elements could support a variety of network and site-specific safety analyses, as well as support the methods introduced
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The Federal Highway Administration (FHWA) originally published the Model Inventory of Roadway Elements – MIRE 1.0 guidance on a set of recommended safety data elements for State departments of transportation (DOTs) in 2010. These elements could support a variety of network and site-specific safety analyses, as well as support the methods introduced
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Data governance makes data more accessible by implementing standards and assigning responsibilities to each role in the data collection, management, and analysis process. These responsibilities extend to executive leadership in addition to transportation professionals, data managers, and data stewards. This case study documents how the Florida Depa
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This case study highlights the Connecticut Department of Transportation’s (CTDOT’s) recent advancements in its enterprise data systems and processes. The Moving Ahead for Progress in the 21st Century Act (MAP-21) established several requirements to help States advance their roadway safety data development and analysis capabilities. Two key requirem
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This case study highlights a noteworthy example by the Arizona Department of Transportation (ADOT) as the State focuses on the quality of its linear referencing system (LRS). ADOT uses the LRS as the system of record to help manage and integrate datasets between several units and data owners in the agency. ADOT developed a framework for identifying
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United States. Department of Transportation. Federal Highway Administration
2022-01-01
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North Dakota’s US Highway 85 (US 85) expansion project is an example of how State departments of transportation (DOTs) can proactively address emerging system needs through the National Environmental Policy Act (NEPA) process and incorporate safety and minimize environmental impacts (figure 1). In the early 2010’s, North Dakota experienced an econo
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United States. Department of Transportation. Federal Highway Administration
2022-01-01
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PDF
The City of Frankfort, Kentucky’s Second Street Corridor project is an example of how local governments and State departments of transportation (DOTs) can address safety needs during the National Environmental Policy Act (NEPA) process (figure 1). The City of Frankfort received Transportation Investment Generating Economic Recovery (TIGER) funds in
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United States. Department of Transportation. Federal Highway Administration
2022-01-01
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PDF
The Weather-Responsive Management Strategies initiative under the Federal Highway Administration (FHWA) Every Day Counts—Round 5 program promotes the use of road weather data from mobile and connected vehicle technologies to support traffic and maintenance management strategies during inclement weather. The goal is to improve safety and reliability
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Since 2006, the Federal Highway Administration (FHWA) Road Weather Management Program (RWMP) has conducted a periodic assessment of program effectiveness in improving the performance of the transportation system during adverse weather conditions. The RWMP assessments of program performance were conducted and documented in 2009, 2012, 2015, 2017, an
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United States. Department of Transportation. Federal Highway Administration
2022-01-01
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PDF
Public safety agencies, like law enforcement, use Computer-Aided Dispatch (CAD) systems to catalog and coordinate activities. This makes CAD one of the richest sources of real-time incident data, since most road incidents are initially detected through 9-1-1 calls. Timely sharing of this valuable information between public safety and transportation
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