CMF / CRF Details

CMF ID: 885

Reduce shoulder width (6 ft to 4 ft)

Description:

Prior Condition:  No Prior Condition(s)

Category: Shoulder treatments

Study: Estimation of Safety Effectiveness of Changes in Shoulder Width using Case-Control and Cohort Methods, Gross and Jovanis, 2007

 
Star Quality Rating:3 Stars  [View score details]
Rating Points Total:105
Crash Modification Factor (CMF)
Value:1.06
Adjusted Standard Error:
Unadjusted Standard Error:0.019
Crash Reduction Factor (CRF)
Value:-6  (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:1.9
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 95 to Maximum of 25844
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:1997 to 2001
Municipality:
State:PA
Country:
Type of Methodology Used:Regression cross-section
Sample Size (sites):21646 sites
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Dec 01, 2009
Comments: