CMF / CRF Details

CMF ID: 4131

Install automated section speed enforcement system

Description: Installation of automated speed enforcement system. Determines average speed of vehicle over a long distance.

Prior Condition: No automated section speed enforcement system

Category: Advanced technology and ITS

Study: Safety Evaluation of an Automated Section Speed Enforcement System, Montella et al., 2012

Image: View the countermeasure image.

 
Star Quality Rating: 4 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.69
Adjusted Standard Error:
Unadjusted Standard Error: 0.04
Crash Reduction Factor (CRF)
Value: 31   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 4
Applicability
Crash Type: All
Crash Severity: All
Roadway Types: Principal Arterial Other Freeways and Expressways
Number of Lanes: 6
Road Division Type: Divided by Median
Speed Limit: 130 km/h
Area Type: Not specified
Traffic Volume: Minimum of 23000 to Maximum of 42000 Average Daily Traffic (ADT)
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 2009
Municipality:
State:
Country: Italy
Type of Methodology Used: Before/after using empirical Bayes or full Bayes
Sample Size (crashes): 1922 crashes before, 477 crashes after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Nov-01-2012
Comments: