CMF / CRF Details

CMF ID: 5311

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:1 Star  [View score details]
Rating Points Total:25
Crash Modification Factor (CMF)
Value:0.847
Adjusted Standard Error:
Unadjusted Standard Error:0.599
Crash Reduction Factor (CRF)
Value:15.3  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:59.9
Applicability
Crash Type:Run off road
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
Municipality:
State:WA
Country:
Type of Methodology Used:Simple before/after
Sample Size (crashes):4 crashes before, 4 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 fatal and injury run off the road right crashes