CMF / CRF Details

CMF ID: 9129

Install cable median barrier

Description: Install cable median barrier

Prior Condition:  No Prior Condition(s)

Category: Roadside

Study: Digesting the safety effectiveness of cable barrier systems by numbers, Chimba et al.,, 2017

 
Star Quality Rating:3 Stars  [View score details]
Rating Points Total:95
Crash Modification Factor (CMF)
Value:0.15
Adjusted Standard Error:
Unadjusted Standard Error:0.01
Crash Reduction Factor (CRF)
Value:85  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:1
Applicability
Crash Type:Other
Crash Severity:K (fatal),A (serious injury),B (minor injury),C (possible injury)
Roadway Types:All
Street Type:
Minimum Number of Lanes:
Maximum Number of Lanes:
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:Divided by Median
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
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:2003 to 2013
Municipality:
State:TN
Country:USA
Type of Methodology Used:Before/after using empirical Bayes or full Bayes
Sample Size (crashes):742 crashes before, 268 crashes after
Sample Size (sites):577 sites before, 577 sites after
Sample Size (site-years):1731 site-years before, 1731 site-years after
Sample Size (miles):302 miles before, 302 miles after
Sample Size (miles):906 mile-years before, 906 mile-years after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Jan 17, 2018
Comments:Median related crashes.