CMF / CRF Details

CMF ID: 6142

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)
Value: 0.73
Adjusted Standard Error:
Unadjusted Standard Error: 0.192
Crash Reduction Factor (CRF)
Value: 27   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 19.2
Applicability
Crash Type: All
Crash Severity: K (fatal),A (serious 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
Municipality: Flanders
State:
Country: Belgium
Type of Methodology Used: Before/after using comparison group
Sample Size (sites): 65 sites before, 65 sites after
Sample Size (site-years): 252 site-years before, 166 site-years after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Mar-11-2015
Comments: This CMF addresses severe injury crashes within 250 meters of speed camera location, regardless of direction. 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.