An evaluation of Winnipeg's photo enforcement safety program: Results of time series analyses and an intersection camera experiment

The objective of this study was to evaluate the impact of Winnipeg's photo enforcement safety program on speeding, i.e., “speed on green”, and red-light running behavior at intersections as well as on crashes resulting from these behaviors. ARIMA time series analyses regarding crashes related to red-light running (right-angle crashes and rear-end crashes) and crashes related to speeding (injury crashes and property damage only crashes) occurring at intersections were conducted using monthly crash counts from 1994 to 2008. A quasi-experimental intersection camera experiment was also conducted using roadside data on speeding and red-light running behavior at intersections. These data were analyzed using logistic regression analysis. The time series analyses showed that for crashes related to red-light running, there had been a 46% decrease in right-angle crashes at camera intersections, but that there had also been an initial 42% increase in rear-end crashes. For crashes related to speeding, analyses revealed that the installation of cameras was not associated with increases or decreases in crashes. Results of the intersection camera experiment show that there were significantly fewer red light running violations at intersections after installation of cameras and that photo enforcement had a protective effect on speeding behavior at intersections. However, the data also suggest photo enforcement may be less effective in preventing serious speeding violations at intersections. Overall, Winnipeg's photo enforcement safety program had a positive net effect on traffic safety. Results from both the ARIMA time series and the quasi-experimental design corroborate one another. However, the protective effect of photo enforcement is not equally pronounced across different conditions so further monitoring is required to improve the delivery of this measure. Results from this study as well as limitations are discussed.

• Record URL:
  • https://doi.org/10.1016/j.aap.2013.09.023
• Record URL:
  • http://www.sciencedirect.com/science/article/pii/S0001457513003771
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00014575
• Supplemental Notes:
  • Abstract reprinted with permission from Elsevier.
• Authors:
  • Vanlaar, Ward
  • Robertson, Robyn
  • Marcoux, Kyla
• Publication Date: 2014-1

Language

• English

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 238-247
• Serial:
  • Accident Analysis & Prevention
  • Volume: 62
  • Issue Number: 0
  • Publisher: Elsevier
  • ISSN: 0001-4575
  • Serial URL: http://www.sciencedirect.com/science/journal/00014575

Subject/Index Terms

• TRT Terms: Cameras; Highway safety; Intersections; Red light running; Speeding; Time series analysis; Traffic crashes; Traffic law enforcement; Traffic safety
• Uncontrolled Terms: Program evaluation
• Geographic Terms: Winnipeg (Canada)
• Subject Areas: Highways; Safety and Human Factors; I80: Accident Studies;

Filing Info

• Accession Number: 01515889
• Record Type: Publication
• Files: TRIS
• Created Date: Feb 25 2014 9:15AM