Grande Prairie, AB, CAN 2009 RLC Report

Official Title: Review of Red Light Camera Program

Author: Garry Roth, Program Manager

Summary:
This is a 2009 report by the city of Grande Prairie, Alberta, Canada on the effects of red-light and speed cameras in the city of Grande Prairie. This study compares the before and after crash statistics of 3 RLC intersections in that city. The study uses 60 months of pre-RLC crash data compared to 12 months of post-RLC data. The statistics used in this analysis are from the Grande Prairie Police Department and the report does not defined a set Distance-From-Intersection inclusion zone for crashes. There are no data or conclusions in this report that suggest a reduction or increase in fatalities due to RLCs. The results show that total crashes at RLC-equipped intersections have increased by 43% and injury crashes have increased by 126% after RLCs were installed. The study concludes that: "There have not been significant reductions in collisions, while only a few of these collisions during this time fram, have actually resulted from a red light violation."

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Comments:
This is a basic 4 page report, the data and statistical analysis appear valid. One slightly diminishing factor is that there is at least a two year gap between the pre and post RLC periods, which is something that diminishes the validity of the report, although the very long pre-RLC period somewhat adds to the validity of the report. The post RLC period is slightly below average for this kind of report. The selection of 7 RLC intersections is a below-average number of intersections for this kind of study and somewhat diminishes the usefulness of the report. The report uses no control intersections to help validate the data conclusions. The conclusions are supported by the supplied data.

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St Pete Driver,
Dec 23, 2012, 5:43 AM
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