CMF / CRF Details

CMF ID: 5302

Install centerline rumble strips on roads with existing shoulder rumble strips

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

Prior Condition: Shoulder Rumble Strips Only

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]
Crash Modification Factor (CMF)
Value: 0.353
Adjusted Standard Error:
Unadjusted Standard Error: 0.105
Crash Reduction Factor (CRF)
Value: 64.7   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Applicability
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: 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): 29 crashes before, 18 crashes after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Dec-02-2013
Comments: Exposure is VMTBefore MVMT = 242.42After MVMT = 428.57Crash type is total crossover crashes