CMF / CRF Details

CMF ID: 2425

Install centerline and shoulder rumble strips

Description: Milled or rolled rumble strips.

Prior Condition: No Prior Condition(s)

Category: Roadway

Study: Impact of Rumble Strips on Collision Reduction on BC Highways: A Comprehensive Before and After Safety Study, Sayed et al., 2010

 
Star Quality Rating: 4 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.79
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value: 21.4   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Applicability
Crash Type: Cross median,Frontal and opposing direction sideswipe,Head on,Run off road
Crash Severity: All
Roadway Types: Principal Arterial Other
Number of Lanes: 2
Road Division Type: Undivided
Speed Limit:
Area Type:
Traffic Volume:
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: 2000 to 2006
Municipality: British Columbia
State:
Country:
Type of Methodology Used: Before/after using empirical Bayes or full Bayes
Sample Size (site-years): 34 site-years before, 102 site-years after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse:
Comments: