CMF / CRF Details

CMF ID: 10447

Install centerline and shoulder rumble strips

Description: Milled or rolled rumble strips.

Prior Condition: No Prior Condition(s)

Category: Roadway

Study: Rectangular Rumble Strip Safety Evaluation, Storm et al., 2020

Star Quality Rating: 4 Stars   [View score details]
Rating Points Total: 110
Crash Modification Factor (CMF)
Value: 0.68
Adjusted Standard Error:
Unadjusted Standard Error: 0.087
Crash Reduction Factor (CRF)
Value: 32   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 8.7
Crash Type: Other
Crash Severity: All
Roadway Types: All
Number of Lanes: 2
Road Division Type: Undivided
Speed Limit:
Area Type: Rural
Traffic Volume:
Average Traffic Volume:
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: 2012 to 2018
State: MN
Type of Methodology Used: 7
Sample Size (crashes): 138 crashes
Sample Size (sites): 44 sites
Sample Size (site-years): 218 site-years
Sample Size (mile-years): 1052.37 mile-years
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Aug-14-2020
Comments: This CMF is for Single Vehicle Run Off Road (SVROR) crashes.