In this section
@article{Li:2020:10.1016/j.aap.2020.105488,
author = {Li, H and Zhu, M and Graham, DJ and Zhang, Y},
doi = {10.1016/j.aap.2020.105488},
journal = {Accident Analysis and Prevention},
title = {Are multiple speed cameras more effective than a single one? Causal analysis of the safety impacts of multiple speed cameras},
url = {http://dx.doi.org/10.1016/j.aap.2020.105488},
volume = {139},
year = {2020}
}
TY - JOUR
AB - Most previous studies investigate the safety effects of a single speed camera, ignoring the potential impacts from adjacent speed cameras. The mutual influence between two or even more adjacent speed cameras is a relevant attribute worth taking into account when evaluating the safety impacts of speed cameras. This paper investigates the safety effects of two or more speed cameras observed within a specific radius which are defined as multiple speed cameras. A total of 464 speed cameras at treated sites and 3119 control sites are observed and related to road traffic accident data from 1999 to 2007. The effects of multiple speed cameras are evaluated using pairwise comparisons between treatment units with different doses based on the propensity score methods. The spatial effect of multiple speed cameras is investigated by testing various radii. There are two major findings in this study. First, sites with multiple speed cameras perform better in reducing the absolute number of road accidents than those with a single camera. Second, speed camera sites are found to be most effective with a radius of 200m. For a radius of 200m and 300m, the reduction in the personal injury collisions by multiple speed cameras are 21.4 % and 13.2 % more than a single camera. Our results also suggest that multiple speed cameras are effective within a small radius (200m and 300m).
AU - Li,H
AU - Zhu,M
AU - Graham,DJ
AU - Zhang,Y
DO - 10.1016/j.aap.2020.105488
PY - 2020///
SN - 0001-4575
TI - Are multiple speed cameras more effective than a single one? Causal analysis of the safety impacts of multiple speed cameras
T2 - Accident Analysis and Prevention
UR - http://dx.doi.org/10.1016/j.aap.2020.105488
UR - https://www.ncbi.nlm.nih.gov/pubmed/32126326
UR - http://hdl.handle.net/10044/1/78062
VL - 139
ER -
Transport Strategy Centre
Department of Civil and Environmental Engineering
South Kensington Campus
Imperial College London
London SW7 2AZ - UK
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