COMPARISON OF ACCIDENT CHARACTERISTICS AND RATES FOR COMBINATION VEHICLES WITH ONE OR TWO TRAILERS

Accident involvement rates for tractors with single trailers (singles) are compared with rates for tractors with more than one trailer (doubles) using data from the Bureau of Motor Carrier Safety (BMCS) accident file and the Truck Inventory and Use (TIU) Survey exposure file. Major differences in the distributions of vehicle, driver, operating, and environmental factors for the two types of vehicles are noted, and a multivariate analysis is presented for those factors which are common in the accident and exposure data sets. Overall, the involvement rate for doubles and singles is found to be nearly the same, although there are substantial differences in the type of accidents for each vehicle type. The multivariate analysis indicates that meaningful comparisons of these two vehicle types must account for variation in trailer type (van, tanker, flatbed) and area of operation (local or intercity), since these factors interact strongly with the single/double designation. Other factors, such as the time of day of travel, driver age and experience, and road class are likely to be important determinants of accident rate, but exposure data are not currently available in the form required to conduct the same kinds of analyses for these. The need for further exposure information is discussed.

  • Corporate Authors:

    Highway Safety Research Institute

    Huron Parkway and Baxter Road
    Ann Arbor, MI  United States  48109
  • Publication Date: 1981-8

Subject/Index Terms

Filing Info

  • Accession Number: 00321371
  • Record Type: Publication
  • Source Agency: Transportation Statistical Reference File, TSC
  • Report/Paper Numbers: One-Time
  • Files: TSR
  • Created Date: Aug 30 1982 12:00AM