The primary objective of this report was to evaluate and determine the effectiveness that automated traffic enforcement systems have on reducing right angle, rear end and other crash types at signal controlled intersections within the State of Texas. A list of communities that maintain automated traffic enforcement systems within the State was obtained along with the intersections that were monitored. Information related to intersection geometry, traffic flow, signalization parameters, and other descriptive data for the intersections were also collected.

A total of 11,122 crashes took place within the intersections identified for this study. Of those crashes, 5,869 crashes occurred “before” automated traffic enforcement systems were activated. After the treatments were installed, a total of 5,253 crashes occurred. The number of crashes decreased by 616 events at the treatment intersections. This number represents the results across all three intersection groups. The Crash Records Information System (CRIS) records regarding collision frequency for first, second, and third years before and after system activation time periods are summarized below.

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