CMF / CRF Details

CMF ID: 8214

Install cable median barrier (high tension)

Description:

Prior Condition:  No median barrier

Category: Roadside

Study: Development of Crash Modification Factors for Installation of High-Tension Cable Median Barrier, Russo et al., 2016

 
Star Quality Rating:4 Stars  [View score details]
Rating Points Total:120
Crash Modification Factor (CMF)
Value:0.47
Adjusted Standard Error:
Unadjusted Standard Error:0.12
Crash Reduction Factor (CRF)
Value:53  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:12
Applicability
Crash Type:Other
Crash Severity:K (fatal),A (serious injury)
Roadway Types:Principal Arterial Other Freeways and Expressways
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:
Traffic Volume:Minimum of 1508 to Maximum of 99850 Annual Average Daily Traffic (AADT)
Average Traffic Volume:21382 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:2004 to 2013
Municipality:
State:MI
Country:USA
Type of Methodology Used:Before/after using empirical Bayes or full Bayes
Sample Size (crashes):284 crashes before, 76 crashes after
Sample Size (miles):300 miles before, 300 miles after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Jan 17, 2017
Comments:CMF applies to target crashes on segment with median width 26 to 50 feet. Target crashes refer to any crash in which a crash-involved vehicle left the roadway and entered the median, regardless of whether median entry was a primary or secondary event.