CMF / CRF Details

CMF ID: 974

Install median barrier

Description:

Prior Condition: No Prior Condition(s)

Category: Roadside

Study: Development of Crash Reduction Factors, Hovey and Chowdhury, 2005

 
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Crash Modification Factor (CMF)
Value: 0.14
Adjusted Standard Error:
Unadjusted Standard Error: 0.029
Crash Reduction Factor (CRF)
Value: 86   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 2.9
Applicability
Crash Type: All
Crash Severity: All
Roadway Types: All
Number of Lanes:
Road Division Type:
Speed Limit:
Area Type: All
Traffic Volume:
Average Traffic Volume:
Time of Day:
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:
Municipality:
State: OH
Country:
Type of Methodology Used: Before/after using empirical Bayes or full Bayes
Sample Size (sites): 4 sites after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Dec-01-2009
Comments: