CMF / CRF Details

CMF ID: 5296

Install shoulder rumble strips


Prior Condition: No Rumble strips present

Category: Shoulder treatments

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: 1 Star   [View score details]
Crash Modification Factor (CMF)
Value: 1.053
Adjusted Standard Error:
Unadjusted Standard Error: 0.633
Crash Reduction Factor (CRF)
Value: -5.3   (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 63.3
Crash Type: Head on,Sideswipe
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:
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): 4 crashes before, 9 crashes after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Dec-02-2013
Comments: VMT based studyVMT before = 27.03 MVMTVMT After = 57.69 MVMTCrash type is crossing centerline crashes