CMF / CRF Details

CMF ID: 4145

Install automated section speed enforcement system on tangents

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]
Rating Points Total:130
Crash Modification Factor (CMF)
Value:0.72
Adjusted Standard Error:
Unadjusted Standard Error:0.04
Crash Reduction Factor (CRF)
Value:28  (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
Street Type:
Minimum Number of Lanes:6
Maximum Number of Lanes:6
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:Divided by Median
Minimum Speed Limit:130
Maximum Speed Limit:130
Speed Unit:km/h
Speed Limit Comment:
Area Type:Not specified
Traffic Volume:Minimum of 23000 to Maximum of 42000 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 2009
Municipality:
State:notusa
Country:Italy
Type of Methodology Used:Before/after using empirical Bayes or full Bayes
Sample Size (crashes):1540 crashes before, 403 crashes after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Nov 01, 2012
Comments: