United States Department of Transportation
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Large Truck Crash Causation Study: Analytical User's Manual
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2006-06-01
[PDF-1.43 MB]
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Corporate Creators:United States. Department of Transportation. Federal Motor Carrier Safety Administration ; United States. Department of Transportation. National Highway Traffic Safety Administration ; United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
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Abstract:The Motor Carrier Safety Improvement Act of 1999 (MCSIA), P.L. 106-159, mandated a study to determine the causes of, and contributing factors to, commercial motor vehicle crashes. The U.S. Department of Transportation’s (DOT) Federal Motor Carrier Safety Administration (FMCSA) and National Highway Traffic Safety Administration (NHTSA) conducted a multiyear, nationwide study of factors that contribute to truck crashes. The Large Truck Crash Causation Study’s (LTCCS) goal is to identify effective crash countermeasures. The LTCCS was conducted at 24 data collection sites in 17 States by researchers from NHTSA’s National Automotive Sampling System (NASS) and State truck inspectors. Crash data were coded in two NASS quality control Zone Centers and reviewed by FMCSA and NHTSA personnel and national truck crash experts. The LTCCS collected data on crashes from 2001 through 2003. An attempt was made to ensure that each crash involved at least one large truck with a gross vehicle weight rating of more than 10,000 pounds, and resulted in at least one fatality or at least one incapacitating or nonincapacitating but evident injury. Data were collected on up to 1,000 elements in each crash. To get the highest quality data possible, the onsite investigations began as soon as possible after the crash occurred. Data collection was performed at each crash site by a two-person team consisting of a trained researcher and a State truck inspector. Researchers collected data at crash scenes through driver, passenger, and witness interviews. Subsequent to the crash, each truck and truck driver were subjected to a thorough inspection. After leaving the crash scene, researchers collected additional interview data by telephone from motor carriers responsible for the trucks and surrogate drivers of trucks and other vehicles when the actual drivers could not be interviewed as a result of a fatal or serious injury. Researchers also reviewed police crash reports, hospitals records, and coroners’ reports. In addition, researchers often revisited the crash scene to make more accurate scene diagrams and search for additional data. Together the teams collected data on approximately 1,000 variables on each crash. Crash case data were provided to NHTSA crash experts for coding, difficult cases were reviewed by NHTSA and FMCSA headquarters staff, and finalized cases were sent to DOT’s Volpe National Transportation Systems Center for inclusion in the study’s electronic database.
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