CMF / CRF Details

CMF ID: 7836

Decrease paved right shoulder from 8-ft to X

Description:

Prior Condition:  Roadway with 8-ft right paved shoulders

Category: Shoulder treatments

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:90
Crash Modification Factor (CMF)
Value:1.37
Adjusted Standard Error:
Unadjusted Standard Error:0.07
Crash Reduction Factor (CRF)
Value:-37  (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:7
Applicability
Crash Type:All
Crash Severity:K (fatal),A (serious injury),B (minor injury),C (possible injury)
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:All
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:Rural
Traffic Volume:Minimum of 5000 to Maximum of 35000 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):317 sites
Sample Size (site-years):951 site-years
Sample Size (miles):135.326 miles
Sample Size (mile-years):406 mile-years
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Mar 08, 2016
Comments:CMFs of narrowing paved right shoulder width from 8-ft to 4-ft on rural multilane highways.