CMF / CRF Details

CMF ID: 5283

Widen paved shoulder from 3 ft to 7 ft

Description:

Prior Condition:  Paved shoulder width = 3ft

Category: Shoulder treatments

Study: NCHRP Report 633: Impact of Shoulder Width and Median Width on Safety, Stamatiadis et al., 2009

 
Star Quality Rating:3 Stars  [View score details]
Rating Points Total:95
Crash Modification Factor (CMF)
Value:0.76
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value:24  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Applicability
Crash Type:All
Crash Severity:All
Roadway Types:All
Street Type:
Minimum Number of Lanes:
Maximum Number of Lanes:
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:Undivided
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:Not specified
Traffic Volume:
Average Traffic Volume:
Time of Day:
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:CA,KY,MN
Country:
Type of Methodology Used:Regression cross-section
Sample Size (mile-years):2308 mile-years
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Dec 02, 2013
Comments: