CMF / CRF Details

CMF ID: 8212

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

 
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Crash Modification Factor (CMF)
Value: 0.97
Adjusted Standard Error:
Unadjusted Standard Error: 0.15
Crash Reduction Factor (CRF)
Value: 3   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 15
Applicability
Crash Type: Other
Crash Severity: B (minor injury)
Roadway Types: Principal Arterial Other Freeways and Expressways
Number of Lanes:
Road Division Type: Divided by Median
Speed Limit:
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): 435 crashes before, 170 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. Applies to B-injury crashes on KABCO scale.