CMF / CRF Details

CMF ID: 5298

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]
Rating Points Total:20
Crash Modification Factor (CMF)
Value:1.404
Adjusted Standard Error:
Unadjusted Standard Error:1.623
Crash Reduction Factor (CRF)
Value:-40.4  (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:162.3
Applicability
Crash Type:Run off road
Crash Severity:All
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:
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):1 crashes before, 3 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 run off the road right