CMF / CRF Details

CMF ID: 5366

Widen paved shoulder from 3 ft to 5 ft

Description:

Prior Condition:  Shoulder width 3 ft

Category: Shoulder treatments

Study: Safety Effects of Lane Width and Shoulder Width on Two-Lane Rural State Highways in Idaho, Abdel-Rahim and Sonnen, 2012

 
Star Quality Rating:3 Stars  [View score details]
Rating Points Total:105
Crash Modification Factor (CMF)
Value:0.95
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value:5  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Applicability
Crash Type:All
Crash Severity:All
Roadway Types:Not specified
Street Type:
Minimum Number of Lanes:2
Maximum Number of Lanes:2
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:Rural
Traffic Volume:Minimum of 186 to Maximum of 15106 Annual Average Daily Traffic (AADT)
Average Traffic Volume:2218 Annual Average Daily Traffic (AADT)
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:1993 to 2010
Municipality:
State:ID
Country:USA
Type of Methodology Used:Regression cross-section
Sample Size (crashes):7977 crashes
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Jan 09, 2014
Comments: