CMF / CRF Details

CMF ID: 10372

Install centerline rumble strips

Description:

Prior Condition: No centerline Rumble strip

Category: Roadway

Study: Investigating Safety Impact of Center Line Rumble Strips, Lane Conversion, Roundabout and J-Turn Features on Louisiana Highways, Sun and Rahman, 2019

 
Star Quality Rating: 5 Stars   [View score details]
Rating Points Total: 140
Crash Modification Factor (CMF)
Value: 0.831
Adjusted Standard Error:
Unadjusted Standard Error: 0.016
Crash Reduction Factor (CRF)
Value: 16.9   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 1.6
Applicability
Crash Type: All
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: Minimum of 240 to Maximum of 18633 Annual Average Daily Traffic (AADT)
Average Traffic Volume: 3337 Annual Average Daily Traffic (AADT)
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 2015
Municipality:
State: LA
Country: USA
Type of Methodology Used: Before/after using empirical Bayes or full Bayes
Sample Size (crashes): 5829 crashes before, 4950 crashes after
Sample Size (sites): 281 sites before, 281 sites after
Sample Size (miles): 1865.33 miles before, 1865.33 miles after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Jun-01-2020
Comments: