CMF / CRF Details

CMF ID: 5264

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: 2 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 1.21
Adjusted Standard Error:
Unadjusted Standard Error: 0.348
Crash Reduction Factor (CRF)
Value: -21   (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 34.8
Applicability
Crash Type: All
Crash Severity: A (serious injury),B (minor injury),C (possible injury)
Roadway Types: Not specified
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: 2007 to 2011
Municipality:
State: ND
Country:
Type of Methodology Used: Simple before/after
Sample Size (crashes): 22 crashes before, 32 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.