Accidents at junctions on one-way urban roads

A study of personal injury accidents at junctions with one or more one-way arms on urban 30mph single carriageway roads was conducted. The aim was to determine how these accidents are related to vehicle and pedestrian flows and to the features and layout of the junction. The study comprised 3- and 4-arm priority junctions and 3- and 4-arm signal junctions, with 433 junctions included in the study. Records of all reported personal injury accidents occurring at the junctions were obtained for the period 1987-1994. Accident predictive models were developed. The mean pedestrian flow at the junctions, generally located in town or city centres, was very high and over a third of accidents involved a pedestrian. At 3-arm junctions, one way traffic did not affect accident rates whereas at 4-arm junctions, a one-way arm reduced accidents. Accident involvement rates were much higher for pedal cycles and motorcycles than for cars and light goods vehicles. At 3-arm priority sites, kerbed central islands were associated with fewer merging and diverging accidents but more pedestrian accidents. Priority junctions with longer queues had increased accident risk. Pedestrian guard railing was not associated with fewer pedestrian accidents. At 3-arm signal junctions and 4-arm junctions, higher mean traffic speed was associated with increases in some accident types. Vehicle proportion variables increased risk for various accident types. The whole-junction models have been incorporated into the computer program SafeNET.

  • Corporate Authors:


    Crowthorne House, Nine Mile Ride
    Wokingham, Berkshire  United Kingdom  RG40 3GA
  • Authors:
    • KENNEDY, J V
    • HALL, R D
    • BARNARD, S R
  • Publication Date: 2004


  • English

Subject/Index Terms

Filing Info

  • Accession Number: 01011821
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Dec 19 2005 3:34PM