CMF / CRF Details

CMF ID: 2827

Pave narrow shoulder through curve

Description:

Prior Condition:  No Prior Condition(s)

Category: Shoulder treatments

Study: Benefit-Cost Analysis of In-Vehicle Technologies and Infrastructure Modifications as a Means to Prevent Crashes Along Curves and Shoulders, Pitale et al., 2009

 
Star Quality Rating:1 Star  [View score details]
Rating Points Total:0
Crash Modification Factor (CMF)
Value:2.04
Adjusted Standard Error:
Unadjusted Standard Error:0.76
Crash Reduction Factor (CRF)
Value:-104  (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:76
Applicability
Crash Type:All
Crash Severity:All
Roadway Types:Principal Arterial Other
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:
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:
Traffic Volume:
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:
Municipality:
State:MN
Country:USA
Type of Methodology Used:Simple before/after
Sample Size (crashes):10 crashes before, 30 crashes after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Mar 21, 2011
Comments:For 25 curves. The increase in crashes was not consistent with a past cross sectional study which suggested that crashes should decrease. The authors note that the shoulders may have encouraged drivers in increase speeds along the curves.

View the Full Study Details