CMF / CRF Details

CMF ID: 5266

Install centerline and shoulder rumble strips

Description: Milled or rolled rumble strips.

Prior Condition: No centerline or rumble strips present

Category: Roadway

Study: Rumble Strips in North Dakota: A Comparison of Road Segments, Safety, and Crash Patterns, A. Kubas, P. Kayabas, K. Vachal, and M. Berwick, 2013

Star Quality Rating: 1 Star   [View score details]
Rating Points Total: 15
Crash Modification Factor (CMF)
Value: 0.71
Adjusted Standard Error:
Unadjusted Standard Error: 0.184
Crash Reduction Factor (CRF)
Value: 29   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 18.4
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: Undivided
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
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: 2007 to 2011
State: ND
Type of Methodology Used: Simple before/after
Sample Size (crashes): 36 crashes before, 31 crashes after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Dec-02-2013
Comments: Traffic volume was reported in VMT. VMT before was 86,522,040 vehicle-miles and 104,286,686 after.