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)
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
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.