CMF / CRF Details

CMF ID: 7266

Implement automated speed enforcement cameras

Description:

Prior Condition:  No automated speed enforcement cameras

Category: Advanced technology and ITS

Study: Development of Crash Modification Factors of Alignment Elements and Safety Countermeasures for Korean Freeways, Choi et al., 2015

 
Star Quality Rating:4 Stars  [View score details]
Rating Points Total:120
Crash Modification Factor (CMF)
Value:0.942
Adjusted Standard Error:
Unadjusted Standard Error:0.153
Crash Reduction Factor (CRF)
Value:5.8  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:15.3
Applicability
Crash Type:All
Crash Severity:All
Roadway Types:Principal Arterial Other Freeways and Expressways
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:
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:
Traffic Volume:Minimum of 4000 to Maximum of 58000 Annual Average Daily Traffic (AADT)
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:2001 to 2008
Municipality:
State:notusa
Country:Korea
Type of Methodology Used:Before/after using empirical Bayes or full Bayes
Sample Size (crashes):421 crashes before, 259 crashes after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Nov 01, 2015
Comments:AADT range is for freeways in the reference group.