CMF / CRF Details

CMF ID: 5310

Install shoulder rumble strips on roads with existing centerline rumble strips

Description: Install shoulder rumble strips on roads with existing centerline rumble strips

Prior Condition: Existing Centerline Rumble Strips

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: 2 Stars   [View score details]
Rating Points Total: 45
Crash Modification Factor (CMF)
Value: 0.53
Adjusted Standard Error:
Unadjusted Standard Error: 0.15
Crash Reduction Factor (CRF)
Value: 47   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 15
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: 3
Sample Size (crashes): 32 crashes before, 20 crashes after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Dec-02-2013
Comments: Exposure is presented as VMTBefore MVMT = 196.26After MVMT = 231.34Crash type is total run off the road right crashes