CMF / CRF Details

CMF ID: 4673

Install automated speed camera at signalized intersection

Description: Install an automated speed camera (photo radar) at a signalized intersection

Prior Condition: Signalized intersection with no automated speed enforcement camera.

Category: Advanced technology and ITS

Study: Evaluation of the Photo Enforcement Safety Program of the City of Winnipeg, Vanlaar, Robertson, and Marcoux, 2011

 
Star Quality Rating: 3 Stars   [View score details]
Rating Points Total: 90
Crash Modification Factor (CMF)
Value: 0.76
Adjusted Standard Error:
Unadjusted Standard Error: 0.1059
Crash Reduction Factor (CRF)
Value: 24   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 10.59
Applicability
Crash Type: Speed related
Crash Severity: A (serious injury),B (minor injury),C (possible injury)
Roadway Types: Not specified
Number of Lanes:
Road Division Type:
Speed Limit:
Area Type: Not specified
Traffic Volume:
Average Traffic Volume:
Time of Day: All
If countermeasure is intersection-based
Intersection Type: Roadway/roadway (not interchange related)
Intersection Geometry: No values chosen.
Traffic Control: Signalized
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used: 1997 to 2008
Municipality: Winnipeg
State:
Country: Canada
Type of Methodology Used: 3
Sample Size (site-years): 315 site-years before, 233 site-years after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: May-01-2013
Comments: Study used the time series analysis method. 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.