CMF / CRF Details

CMF ID: 4653

Change from permissive to protected

Description: Change from permissive to protected

Prior Condition:  Permissive left-turn phase

Category: Intersection traffic control

Study: Highway Safety Manual, 1st Edition, Various, 2010

Star Quality Rating:Cannot Be Rated (HSM)
Rating Points Total:
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value:6  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Type:All
Crash Severity:All
Roadway Types:Not specified
Street Type:
Minimum Number of Lanes:
Maximum Number of Lanes:
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:Not specified
Traffic Volume:
Average Traffic Volume:
Time of Day:
If countermeasure is intersection-based
Intersection Type:
Intersection Geometry:3-leg,4-leg,More than 4 legs
Traffic Control:Signalized
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:Expert panel
Other Details
Included in Highway Safety Manual?
Date Added to Clearinghouse:Jan 01, 1970
Comments:HSM 1st Ed, Table 14-24. The HSM indicates in a footnote, "If several approaches to a signalized intersection have left-turn phasing, the values of the CMF for each approach should be multiplied together."