This report presents an investigation which comprises police reported accidents in 1975 and 1976 on routes carrying an aadt of 10000 pair of axles on at least one section. The sample was taken from 9 fairly large urban areas. Data on accident frequency, distribution of accident type, number of injured and accident consequences have been provided for each junction and road stretches between junctions. Traffic flow data have been obtained from local authority counts. Number of accidents per million kilometres of pair of axles, and injury rate, number of injured and killed per million kilometres of pair of axles, have been used as measures of traffic safety accident rate. The report also presents A method for the calculation of accident rate on short stretches in urban areas. The routes have been described by means of five road and environment variables: cross-section, environment, distance between junctions, cycle track/no separated cycle track and speed limit. The road network, which comprises a total length of 250 km has been divided into homogeneous road stretches relating to the five variables. Each of these stretches consists of one or more junctions together with the stretches in between. The accident rate has been described as a function of these variables. Not unexpectedly the accident rate was found to be highest in environments with short distances between junctions and in the town centre. The classification and basic data used in the study are of course somewhat approximate. It is doubtful whether accidents should be related merely to the motor vehicle mileage without taking transverse traffic flows and pedestrian/cyclist flows into consideration. Chapter four demonstrates how accident rate and injury rate differ when classification is made with regard to other road and environment variables - partly as regards each individual variable, partly as regards combinations of the variables. The studies reaffirm the difficulties in trying to isolate the influence of the individual variable on the accident rate. Generally there is a strong mutual dependence between the explanatory variables in question - e.g. A higher speed level with improved road quality. (TRRL)

  • Availability:
  • Corporate Authors:

    Blackwell Scientific Publications Limited

    5 Alfred Street
    Oxford OX1 4HB,   England 
  • Authors:
    • Cedersund, HAA
  • Publication Date: 1979


  • Swedish

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Filing Info

  • Accession Number: 00316870
  • Record Type: Publication
  • Source Agency: Swedish National Road and Transport Research Institute (VTI)
  • Report/Paper Numbers: Monograph
  • Files: ITRD, TRIS
  • Created Date: May 21 1981 12:00AM