CMF / CRF Details

CMF ID: 7822

Convert 12-foot lanes to 9-foot or less

Description: Convert 12-foot lanes to 9-foot or less

Prior Condition: Roadway with 12-foot lanes

Category: Roadway

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

 
Star Quality Rating: 2 Stars   [View score details]
Rating Points Total: 70
Crash Modification Factor (CMF)
Value: 0.62
Adjusted Standard Error:
Unadjusted Standard Error: 0.2
Crash Reduction Factor (CRF)
Value: 38   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 20
Applicability
Crash Type: All
Crash Severity: All
Roadway Types: Not specified
Number of Lanes: 2
Road Division Type: All
Speed Limit:
Area Type: Rural
Traffic Volume: Minimum of 103 to Maximum of 56000 Annual Average Daily Traffic (AADT)
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: 2010 to 2012
Municipality:
State: FL
Country: USA
Type of Methodology Used: 7
Sample Size (crashes): 269 crashes
Sample Size (sites): 970 sites
Sample Size (site-years): 2910 site-years
Sample Size (miles): 904 miles
Sample Size (mile-years): 2712 mile-years
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Mar-08-2016
Comments: The speed limit here is the average speed limit.