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Safety Effects of Automated Mobile Photo Enforcement Open Access


Other title
Empirical Bayes
photo enforcement
before-and-after evaluation
traffic safety
Type of item
Degree grantor
University of Alberta
Author or creator
Li, Ran
Supervisor and department
Kim, Amy (Civil and Environmental Engineering)
El-Basyouny, Karim (Civil and Environmental Engineering)
Examining committee member and department
Kim, Amy (Civil and Environmental Engineering)
Mohamed, Yasser (Civil and Environmental Engineering)
Qiu, Zhijun (Civil and Environmental Engineering)
El-Basyouny, Karim (Civil and Environmental Engineering)
Department of Civil and Environmental Engineering
Transportation Engineering
Date accepted
Graduation date
Master of Science
Degree level
This thesis evaluated the safety effects of automated mobile enforcement at both the segment-based level and city-wide level over a period of eight years. For the segment-based evaluation, the before-and-after Empirical Bayes (EB) method was used to account for the regression-to-the-mean effect and other confounding factors. Locally developed safety performance functions and yearly calibration factors for different collision severities/types were developed by using a group of reference urban arterial roads. The results showed consistent reductions in different collision severities/types ranging from 14% to 20%, with the highest reductions observed for severe (i.e. injury and fatal) collisions. The comparison between continuous and discontinuous enforcement strategies on different arterials revealed that continuous enforcement was far more effective in reducing all collision severities and types. Moreover, the thesis also validated the spillover effects on nearby segments. For the city-wide evaluation, generalized linear regression models were adopted to investigate the relationship between the enforcement variables and the monthly number of collisions. It was found that both the deployment hours and the number of issued tickets had an inverse relationship with the collision frequency. The analysis results also suggested that 1,500 hours of deployment should be the threshold to guarantee significant impacts on collision reduction.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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