Critical review of causes leading to

Causality - What are causes, mechanisms, and the like?

Critical review of causes leading to

From thelarge truck crashes that occurred between April and Decembera nationally representative sample was selected. Each crash in the LTCCS sample involved at least one large truck and resulted in a fatality or injury.

The total LTCCS sample of crashes involved 1, large trucks and motor vehicles that were not large trucks. The crashes resulted in fatalities and 1, injuries.

Introduction

Of the 1, large trucks in the sample, 77 percent were tractors pulling a single semi-trailer, and 5 percent were trucks carrying hazardous materials. Of the crashes in the sample, 73 percent involved a large truck colliding with at least one other vehicle. Defining Causation Motor vehicle crashes are complex events.

Usually they involve two or more vehicles.

Critical review of causes leading to

Elements that influence the occurrence of a crash may take place hours, days, or months before the crash. They include driver training and experience, vehicle design and manufacture, highway condition and traffic signaling, and weather conditions.

Other elements may take place immediately before a crash, such as a decision to turn in traffic, a tire blowout, or snow. Crash reconstruction experts rarely conclude that crashes are the result of a single factor. Fatigue, drinking alcohol, and speeding are major factors in motor vehicle crashes overall.

Although their presence does not always result in a crash, these three factors, as well as other driver, vehicle, and environmental factors, can increase the risk that a crash will occur. A crash researcher and a State truck inspector traveled to each crash site as soon as possible after the crash occurred.

After leaving the crash scene, the researchers collected additional data through interviews with motor carriers and, when the actual drivers could not be interviewed, surrogate drivers. Each of the LTCCS study cases was assigned a sampling weight, which allows for national estimates of total fatal and injury truck crashes during the study period.

All study results presented here are national estimates for thelarge trucks that were estimated by NHTSA to have been involved in fatal and injury crashes during the study period. The estimates may differ from true values, because they are based on a probability sample of crashes and not a census of all crashes.

The size of the difference may vary, depending on which LTCCS sample is the focus of a particular table or analysis.

Coding Crash Causation Variables Many variables were coded from the hundreds of data elements collected on each crash. Three key variables were coded for assessing crash risk: The action or event that put the vehicle or vehicles on a course that made the collision unavoidable.

The critical event is assigned to the vehicle that took the action that made the crash inevitable. The immediate reason for the critical event i.

The critical reason is assigned to the vehicle coded with the critical event in the crash. It can be coded as a driver error, vehicle failure, or environmental condition roadway or weather. The person, vehicle, and environmental conditions present at the time of the crash.

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The Federal Motor Carrier Safety Administration (FMCSA) and the National Highway Traffic Safety Administration (NHTSA) conducted the Large Truck Crash Causation Study (LTCCS) to examine the reasons for serious crashes involving large trucks (trucks with a gross vehicle weight rating over 10, pounds).

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