CMF / CRF Details

CMF ID: 5313

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: 2 Stars   [View score details]
Rating Points Total: 50
Crash Modification Factor (CMF)
Value: 0.44
Adjusted Standard Error:
Unadjusted Standard Error: 0.142
Crash Reduction Factor (CRF)
Value: 56   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 14.2
Crash Type: Head on,Run off road,Sideswipe
Crash Severity: K (fatal),A (serious injury)
Roadway Types: Not specified
Street Type:
Minimum Number of Lanes: 2
Maximum Number of Lanes: 2
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: 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
State: WA
Type of Methodology Used: Simple before/after
Sample Size (crashes): 48 crashes before, 12 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 fatal and injury lane departures