CMF / CRF Details

Install centerline rumble strips

Countermeasure ID: 10372

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:

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