CMF / CRF Details

CMF ID: 6851

Install centerline and shoulder rumble strips

Description: Milled or rolled rumble strips.

Prior Condition: No rumble strips in PA and MO. Existing shoulder rumble strips in KY (CL rumble strips as retrofits)

Category: Roadway

Study: Safety Evaluation of Centerline Plus Shoulder Rumble Strips, Persaud et al., 2015

 
Star Quality Rating: 5 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.771
Adjusted Standard Error:
Unadjusted Standard Error: 0.034
Crash Reduction Factor (CRF)
Value: 22.9   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 3.4
Applicability
Crash Type: All
Crash Severity: K (fatal),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: Minimum of 154 to Maximum of 25796 Annual Average Daily Traffic (AADT)
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:
Municipality:
State: KY, MO, PA
Country: USA
Type of Methodology Used: Before/after using empirical Bayes or full Bayes
Sample Size (crashes): 2530 crashes before, 761 crashes after
Sample Size (miles): 842 miles before, 842 miles after
Sample Size (miles): 6249 mile-years before, 2562 mile-years after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Nov-01-2015
Comments: CMF for injury crashes (K, A, B, C) for 2-lane rural roads excludes intersection-related and animal crashes.