CMF / CRF Details

CMF ID: 5269

Install shoulder rumble strips


Prior Condition: No shoulder rumble strips

Category: Shoulder treatments

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: 2 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.78
Adjusted Standard Error:
Unadjusted Standard Error: 0.191
Crash Reduction Factor (CRF)
Value: 22   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 19.1
Crash Type: All
Crash Severity: O (property damage only)
Roadway Types: Not specified
Number of Lanes:
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: 2007 to 2011
State: ND
Type of Methodology Used: Simple before/after
Sample Size (crashes): 38 crashes before, 34 crashes after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Dec-02-2013
Comments: Exposure is presented as Vehicle Miles Travelled. The before VMT is 39,246,866 and the after VMT is 44,914,021.