CMF / CRF Details

CMF ID: 5316

Install centerline and shoulder rumble strips

Description: Milled or rolled rumble strips.

Prior Condition: No Rumble Strips

Category: Roadway

Study: Performance Analysis of Centerline and Shoulder Rumble Strips Installed in Combination in Washington State, D. Olson, M. Sujka, and B. Manchas, 2013

 
Star Quality Rating: 3 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.384
Adjusted Standard Error:
Unadjusted Standard Error: 0.064
Crash Reduction Factor (CRF)
Value: 61.6   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 6.4
Applicability
Crash Type: Run off road
Crash Severity: All
Roadway Types: Not specified
Number of Lanes: 2
Road Division Type:
Speed Limit:
Area Type: Rural
Traffic Volume:
Average Traffic Volume:
Time of Day: Not specified
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: 2002 to 2010
Municipality:
State: WA
Country:
Type of Methodology Used: Simple before/after
Sample Size (crashes): 197 crashes before, 43 crashes after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Dec-02-2013
Comments: Exposure presented as VMTBefore MVMT = 1,341.7After MVMT = 765.96Crash type is total run off the road right