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)
Crash Modification Factor (CMF)
Value: 0.94
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
Number of Lanes:
Road Division Type:
Speed Limit:
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:
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."