Study Details

Study Title: Safety effects of fixed speed cameras - An empirical Bayes evaluation

Authors: Hoye

Publication Date:SEP, 2015

Abstract: The safety effects of 223 fixed speed cameras that were installed between 2000 and 2010 in Norway were investigated in a before-after empirical Bayes study with control for regression to the mean (RTM). Effects of trend, volumes, and speed limit changes are controlled for as well. On road sections between 100 m upstream and 1 km downstream of the speed cameras a statistically significant reduction of the number of injury crashes by 22% was found. For killed and severely injured (KSI) and on longer road sections none of the results are statistically significant. However, speed cameras that were installed in 2004 or later were found to reduce injury crashes and the number of KSI on road sections from 100 m upstream to both 1 km and 3 km downstream of the speed cameras. Larger effects were found for KSI than for injury crashes and the effects decrease with increasing distance from the speed cameras. At the camera sites (100 m up- and down-stream) crash reductions are smaller and non-significant, but highly uncertain and possibly underestimated.

Study Citation: Hoye, A. "Safety effects of fixed speed cameras - An empirical Bayes evaluation". Accident Analysis and Prevention, Vol. 82, (2015) pp. 263-269.

Study Report: Download the Study Report Document

CMFs Associated With This Study

Category: Speed management

Countermeasure: Installation of fixed speed cameras

CMF CRF(%)QualityCrash TypeCrash SeverityRoadway TypeArea Type
0.9553 StarsAllK,A,B,CNot specifiedRural
0.78223 StarsAllK,A,B,CNot specifiedRural
1.01-12 StarsAllK,A,B,CNot specifiedRural
0.83173 StarsAllK,ANot specifiedRural
0.76243 StarsAllK,ANot specifiedRural
0.86142 StarsAllK,ANot specifiedRural
0.9913 StarsAllK,A,B,CNot specifiedRural
0.88123 StarsAllK,A,B,CNot specifiedRural
1.05-52 StarsAllK,A,B,CNot specifiedRural
1.01-13 StarsAllK,ANot specifiedRural
0.88123 StarsAllK,ANot specifiedRural
0.82182 StarsAllK,ANot specifiedRural
0.9373 StarsAllK,A,B,CNot specifiedRural
0.61393 StarsAllK,A,B,CNot specifiedRural
0.81192 StarsAllK,A,B,CNot specifiedRural
0.61393 StarsAllK,ANot specifiedRural
0.39613 StarsAllK,ANot specifiedRural
0.64362 StarsAllK,ANot specifiedRural
0.87133 StarsAllK,A,B,CNot specifiedRural
0.82183 StarsAllK,A,B,CNot specifiedRural
0.9282 StarsAllK,A,B,CNot specifiedRural
0.48523 StarsAllK,ANot specifiedRural
0.45553 StarsAllK,ANot specifiedRural
1.46-462 StarsAllK,ANot specifiedRural
0.9193 StarsAllK,A,B,CNot specifiedRural
0.68323 StarsAllK,A,B,CNot specifiedRural
0.9192 StarsAllK,A,B,CNot specifiedRural
0.61393 StarsAllK,ANot specifiedRural
0.51493 StarsAllK,ANot specifiedRural
0.89112 StarsAllK,ANot specifiedRural