CMF / CRF Details

CMF ID: 8215

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, , 2016

 
Star Quality Rating: 3 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.76
Adjusted Standard Error:
Unadjusted Standard Error: 0.11
Crash Reduction Factor (CRF)
Value: 24 (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 11
Applicability
Crash Type: Other
Crash Severity: K (fatal),A (serious 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)
Time of Day: All
If countermeasure is intersection-based
Intersection Type:
Intersection Geometry:
Traffic Control:
Major Road Traffic Volume:
Minor Road Traffic 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): 283 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 51 to 94 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.

[View the Full Study Details]

 

The information contained in the Crash Modification Factors (CMF) Clearinghouse is disseminated under the sponsorship of the U.S. Department of Transportation in the interest of information exchange. The U.S. Government assumes no liability for the use of the information contained in the CMF Clearinghouse. The information contained in the CMF Clearinghouse does not constitute a standard, specification, or regulation, nor is it a substitute for sound engineering judgment.