CMF / CRF Details

CMF ID: 7806

10-ft to 50-ft conversion (median width)

Description: Convert a 10-ft traversable median to a 50-ft traversable median

Prior Condition:  Roadway with a 10 ft median

Category: Access management

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:0.79
Adjusted Standard Error:
Unadjusted Standard Error:0.11
Crash Reduction Factor (CRF)
Value:21  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:11
Applicability
Crash Type:All
Crash Severity:All
Roadway Types:Not specified
Street Type:
Minimum Number of Lanes:4
Maximum Number of Lanes:4
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:Divided by Median
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:Urban
Traffic Volume:Minimum of 100 to Maximum of 97000 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 (sites):1011 sites
Sample Size (site-years):3033 site-years
Sample Size (miles):669 miles
Sample Size (mile-years):2007 mile-years
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Mar 08, 2016
Comments:CMFs of widening median from 10 ft to 50 ft on urban 4-lane roadways with partial or no access control