CMF / CRF Details

CMF ID: 7960

Add a through lane on both directions and a raised median

Description:

Prior Condition: Two-lane undivided roadways

Category: Roadway

Study: Validation and Application of Highway Safety Manual (Part D) in Florida, Abdel-Aty et al., 2014

 
Star Quality Rating: 3 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.47
Adjusted Standard Error:
Unadjusted Standard Error: 0.23
Crash Reduction Factor (CRF)
Value: 53   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 23
Applicability
Crash Type: All
Crash Severity: All
Roadway Types: Not specified
Number of Lanes: 2
Road Division Type: Undivided
Speed Limit:
Area Type: Urban
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:
Municipality:
State: FL
Country: USA
Type of Methodology Used: Before/after using empirical Bayes or full Bayes
Sample Size (sites): 12 sites before, 12 sites after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Mar-08-2016
Comments: CMF for Adding Lanes applies for median width in the after period of 12 to 14 ft