CMF / CRF Details

CMF ID: 5294

Install shoulder rumble strips

Description:

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: 1.123
Adjusted Standard Error:
Unadjusted Standard Error: 0.598
Crash Reduction Factor (CRF)
Value: -12.3   (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 59.8
Applicability
Crash Type: Head on,Run off road,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
Municipality:
State: WA
Country:
Type of Methodology Used: Simple before/after
Sample Size (crashes): 5 crashes before, 12 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 lane departures.