CMF / CRF Details

CMF ID: 9699

Install centerline rumble strips

Description:

Prior Condition:  No Prior Condition(s)

Category: Roadway

Study: Examining the Safety Effect of Centerline Rumble Strips on Curves on Rural Two-Lane Roads, Babiceanu and Fontaine, 2018

 
Star Quality Rating:3 Stars  [View score details]
Rating Points Total:85
Crash Modification Factor (CMF)
Value:0.997
Adjusted Standard Error:
Unadjusted Standard Error:0.06
Crash Reduction Factor (CRF)
Value:0.3  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:6
Applicability
Crash Type:All
Crash Severity:K (fatal),A (serious injury),B (minor injury),C (possible injury)
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 2100 to Maximum of 18000 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:2004 to 2016
Municipality:
State:VA
Country:USA
Type of Methodology Used:Before/after using empirical Bayes or full Bayes
Sample Size (crashes):393 crashes before, 434 crashes after
Sample Size (sites):413 sites before, 413 sites after
Sample Size (site-years):2065 site-years before, 2065 site-years after
Sample Size (miles):106.1 miles before, 106.1 miles after
Sample Size (miles):530.5 mile-years before, 530.5 mile-years after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Oct 27, 2018
Comments:CMF for both all segments (both tangents and horizontal curves)

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