CMF / CRF Details

CMF ID: 7827

Convert 12-foot lanes to 10-foot lanes

Description: Convert 12-foot lanes to 10-foot lanes

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:3 Stars  [View score details]
Rating Points Total:85
Crash Modification Factor (CMF)
Value:0.58
Adjusted Standard Error:
Unadjusted Standard Error:0.13
Crash Reduction Factor (CRF)
Value:42  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:13
Applicability
Crash Type:All
Crash Severity:All
Roadway Types:Not specified
Street Type:
Minimum Number of Lanes:2
Maximum Number of Lanes:
Number of Lanes Direction:
Number of Lanes Comment:> = 2 Lanes
Crash Weather:Not specified
Road Division Type:Divided by Median
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:Rural
Traffic Volume:Minimum of 1600 to Maximum of 139000 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:Regression cross-section
Sample Size (crashes):678 crashes
Sample Size (sites):415 sites
Sample Size (site-years):1245 site-years
Sample Size (miles):262.72 miles
Sample Size (mile-years):788 mile-years
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Mar 08, 2016
Comments:CMFs of narrowing lane width from 12 feet to 10 feet on rural divided multi-lane roadways. Speed limit here is the average speed limit.