The question is posed which are the circumstances for the Traffic Conflicts Technique to generate more reliable accident rate estimates than those obtained from the history of accident occurrence. The provide an answer, expressions for the variance of the expected annual accident rate are derived for both methods. Based on several applications of the Traffic Conflicts Technique by various researchers, the variability of the "accident-to-conflict" ratio is examined. The analytical machinery so created allows provision of answers to the aforementioned question. It facilitates also derivation of guidelines with respect to the conduct of Traffic Conflicts studies. It appears that the Traffic Conflicts Technique can be used to advantage at locations with less than 4 accidents per year or when accident records are not usable. One day appears to be the best duration of a field count of conflicts. Adoption of a narrower operational definition of "conflict" is suggested.

  • Supplemental Notes:
    • Sponsored by National Research Council of Canada.
  • Corporate Authors:

    University of Toronto

    Department of Civil Engineering, 35 St George Street
    Toronto, Ontario  Canada  M5S 1A4
  • Authors:
    • Hauer, E
  • Publication Date: 1975-1

Media Info

  • Features: Figures; References;
  • Pagination: 28 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00132116
  • Record Type: Publication
  • Source Agency: Highway Safety Research Institute
  • Report/Paper Numbers: Report No. 75-01
  • Contract Numbers: A8158
  • Files: TRIS
  • Created Date: Nov 9 1977 12:00AM