CMF / CRF Details

CMF ID: 7262

Install centerline and shoulder rumble strips

Description: Milled or rolled rumble strips.

Prior Condition: Minimum paved roadway width of 20ft and shoulder width 6ft or greater

Category: Roadway

Study: Safety Impacts of a Statewide Centerline Rumble Strip Installation Program, Kay et al., 2015

Star Quality Rating: 3 Stars   [View score details]
Rating Points Total: 100
Crash Modification Factor (CMF)
Value: 0.463
Adjusted Standard Error:
Unadjusted Standard Error: 0.004
Crash Reduction Factor (CRF)
Value: 53.7   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 0.36
Crash Type: Angle,Head on,Rear end,Sideswipe,Single vehicle,Other
Crash Severity: B (minor injury)
Roadway Types: Principal Arterial Other
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: Undivided
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type: Rural
Traffic Volume:
Average Traffic Volume: 5092 Annual Average Daily Traffic (AADT)
Time of Day: All
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: 2005 to 2013
State: MI
Country: USA
Type of Methodology Used: Before/after using empirical Bayes or full Bayes
Sample Size (crashes): 119 crashes before, 81 crashes after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Nov-01-2015
Comments: Target Crashes (B Injury) = angle, head-on, other, rear end, sideswipe opposite, sideswipe same, and single vehicle