CMF / CRF Details

CMF ID: 6140

Installation of fixed speed cameras

Description: Installation of fixed speed cameras on arterials limited access freeways

Prior Condition:  No Speed Cameras Present

Category: Speed management

Study: An evaluation of the traffic safety effect of fixed speed cameras, De Pauw et al., 2014

Star Quality Rating:1 Star  [View score details]
Rating Points Total:20
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:0.087
Crash Reduction Factor (CRF)
Value:10  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:8.7
Crash Type:All
Crash Severity:K (fatal),A (serious injury),B (minor injury),C (possible injury)
Roadway Types:Not specified
Street Type:
Minimum Number of Lanes:1
Maximum Number of Lanes:2
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:
Minimum Speed Limit:30
Maximum Speed Limit:55
Speed Unit:km/h
Speed Limit Comment:50 - 90 km/h converted to mph
Area Type:All
Traffic Volume:
Average Traffic Volume:
Time of Day:All
If countermeasure is intersection-based
Intersection Type:
Intersection Geometry:
Traffic Control:
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:2000 to 2008
Type of Methodology Used:Before/after using comparison group
Sample Size (sites):32 sites before, 32 sites after
Sample Size (site-years):124 site-years before, 82 site-years after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Mar 11, 2015
Comments:This CMF addresses all injury crashes within 500 meters of the speed camera location in both directions and includes the effect of other measures implemented with the camera, including: a decrease in the legally imposed speed limit, resurfacing, or changes in bicyclist or pedestrian facilities. The number of crashes in the after period were not reported in this study, however, they have been recorded as 300 to give 10 points as a beneift of doubt for one or more of the following: (1) number of miles/sites in the reference/treatment group, (2) number of crashes in the references/treatment group, (3) reporting AADTs for the aggregate dataset but not for the disaggragate dataset used for CMF development.