CMF / CRF Details

CMF ID: 5184

Improve superelevation variance (SV) where SV > 0.02

Description: Superelevation variance is the difference between recommended design value for superelevation and existing superelevation on a horizontal curve, where existing superelevation is less than recommended.

Prior Condition:  No Prior Condition(s)

Category: Alignment

Study: Prediction of the Expected Safety Performance of Rural Two-Lane Highways, Harwood et al., 2000

 
Star Quality Rating:Cannot Be Rated (HSM)
Rating Points Total:
Crash Modification Factor (CMF)
Value:Equation
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value:
Adjusted Standard Error:
Unadjusted Standard Error:
Applicability
Crash Type:All
Crash Severity:All
Roadway Types:Minor Arterial
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:Rural
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:
Country:
Type of Methodology Used:Not specified
Other Details
Included in Highway Safety Manual?Yes
Date Added to Clearinghouse:Dec 01, 2009
Comments:Based on a horizontal curve radius of 842.5 ft. To determine the CMF for changing the condition, divide the "new" condition CMF by the "existing" condition CMF.