CMF / CRF Details

CMF ID: 10660

Implement automated speed enforcement cameras


Prior Condition:  1 Speed Enforcement Camera within the 200 m Circular Zone

Category: Advanced technology and ITS

Study: Are multiple speed cameras more effective than a single one? Causal analysis of the safety impacts of multiple speed cameras, Li et al., 2020

Star Quality Rating:4 Stars  [View score details]
Rating Points Total:115
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value:21.44  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Type:All
Crash Severity:K (fatal),A (serious injury),B (minor injury),C (possible injury)
Roadway Types:All
Street Type:
Minimum Number of Lanes:
Maximum Number of Lanes:
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:All
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:All
Traffic Volume:
Average Traffic Volume:32510 Annual Average Daily Traffic (AADT)
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:1999 to 2007
Municipality:Cheshire, Dorset, Hertfordshire, Lancashire, Leicester, London, Manchester, Merseyside, Sussex, and West midlands
Type of Methodology Used:Regression cross-section
Sample Size (sites):50 sites
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Feb 25, 2021
Comments:This CMF is for personal injury collisions within a 200 m radius (circular zone) of a speed camera. The sites are defined as the number of speed cameras within a circular zone, and this CMF compares sites with 2 speed cameras within a circular zone to sites with 1 speed camera within a circular zone.