CMF / CRF Details

CMF ID: 4365

Installing red light running (RLR) cameras for four-way signalized intersection

Description: Installing red light running cameras only on the approaches with high potential for crashes

Prior Condition: No red light running cameras on any of the signalized intersection approaches

Category: Advanced technology and ITS

Study: Red Light Running Camera Assessment, Sperley Ross, 2011

Star Quality Rating: 1 Star   [View score details]
Rating Points Total: 5
Crash Modification Factor (CMF)
Value: 1.774
Adjusted Standard Error:
Unadjusted Standard Error: 0.49
Crash Reduction Factor (CRF)
Value: -77.4   (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 49
Crash Type: Angle,Rear end,Sideswipe
Crash Severity: B (minor injury),O (property damage only)
Roadway Types: Major Collector
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: Undivided
Minimum Speed Limit: 40
Maximum Speed Limit: 40
Speed Unit: mph
Speed Limit Comment:
Area Type: Urban
Traffic Volume:
Average Traffic Volume:
Time of Day: Not specified
If countermeasure is intersection-based
Intersection Type: Roadway/roadway (not interchange related)
Intersection Geometry: 4-leg
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: 2004 to 2009
Municipality: Salem
State: OR
Country: USA
Type of Methodology Used: Simple before/after
Sample Size (crashes): 31 crashes before, 23 crashes after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Dec-06-2012
Comments: - The report compares the monthly average of crashes.- The before period is 50 months and the after period is 21 months.- This CMF considers crashes on the approaches that have RLR cameras installed and covers the full area of influence these approaches.