Contributory factors to traffic crashes at signalized intersections in Hong Kong

S. C. Wong, Nang Ngai Sze, Y. C. Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

147 Citations (Scopus)


Efficient geometric design and signal timing not only improve operational performance at signalized intersections by expanding capacity and reducing traffic delays, but also result in an appreciable reduction in traffic conflicts, and thus better road safety. Information on the incidence of crashes, traffic flow, geometric design, road environment, and traffic control at 262 signalized intersections in Hong Kong during 2002 and 2003 are incorporated into a crash prediction model. Poisson regression and negative binomial regression are used to quantify the influence of possible contributory factors on the incidence of killed and severe injury (KSI) crashes and slight injury crashes, respectively, while possible interventions by traffic flow are controlled. The results for the incidence of slight injury crashes reveal that the road environment, degree of curvature, and presence of tram stops are significant factors, and that traffic volume has a diminishing effect on the crash risk. The presence of tram stops, number of pedestrian streams, road environment, proportion of commercial vehicles, average lane width, and degree of curvature increase the risk of KSI crashes, but the effect of traffic volume is negligible.
Original languageEnglish
Pages (from-to)1107-1113
Number of pages7
JournalAccident Analysis and Prevention
Issue number6
Publication statusPublished - 1 Nov 2007
Externally publishedYes


  • Crash incidence
  • Negative binomial regression
  • Poisson regression
  • Signalized intersections

ASJC Scopus subject areas

  • Human Factors and Ergonomics
  • Safety, Risk, Reliability and Quality
  • Public Health, Environmental and Occupational Health
  • Law


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