SEVERITY OF LARGE-TRUCK AND COMBINATION-VEHICLE ACCIDENTS IN OVER-THE-ROAD SERVICE: A DISCRETE MULTIVARIATE ANALYSIS (DISCUSSION AND CLOSURE)

The severity of large-truck and combinationvehicle accidents was investigated by using 1980 Bureau of Motor Carriers Safety data. The analysis was based on 19,263 accident involvements of such vehicles engaged in over-the-road operation. A two-stage discrete multivariate analysis procedure was used. The first stage involved selecting significant independent variables from 18 candidate variables. The second stage involved modeling accident severity by using two independently estimated logit models, one for the probability of a reported accident being fatal and the other for the probability of a less-severe accident having nonfatal injuries. Differences in the effect of the variables for the four predominant truck types (straight trucks, singles with van, singles with flatbed or tanker, and doubles) led to their separate analyses. The accident severity for each truck type was relatively simple, and most shared common variables and interactions: the main effects of type of collision (single-vehicle or collision with car or commercial vehicle), road class (number of lanes, median separation, and rural or urban setting), and environment (day or night, and road surface wetness condition). The interactions involving road class and environment, and road class and collision type, were usually important. No driver characteristics were found to be significant. Particularly severe accidents were collisions involving passenger cars and doubles, straight trucks, or loaded flatbed or tanker singles on undivided rural roads; collisions involving cars and van singles on undivided rural roads at night; and collisions involving cars and doubles on divided rural roads.

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 23-36
  • Monograph Title: ANALYSIS AND MANAGEMENT OF TRAFFIC ACCIDENT RECORDS
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00394915
  • Record Type: Publication
  • ISBN: 0309037573
  • Report/Paper Numbers: HS-038 640
  • Files: HSL, TRIS, TRB
  • Created Date: Dec 31 1985 12:00AM