CMF / CRF Details

CMF ID: 5183

Improve superelevation variance (SV) where 0.01 <= 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)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Type: All
Crash Severity: All
Roadway Types: Minor Arterial
Number of Lanes: 2
Road Division Type:
Speed Limit:
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:
Type of Methodology Used:
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.