CMF / CRF Details

CMF ID: 4578

Change left-turn phase from permissive to protected/permissive or permissive/protected phasing on one or more approaches

Description: Change from permissive to protected/permissive or permissive/protected phasing on one or more approaches at urban signalized intersection

Prior Condition:  Permitted phasing

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)
Value:0.84
Adjusted Standard Error:
Unadjusted Standard Error:0.02
Crash Reduction Factor (CRF)
Value:16  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:2
Applicability
Crash Type:Left turn
Crash Severity:K (fatal),A (serious injury),B (minor injury),C (possible injury)
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:Urban
Traffic Volume:
Average Traffic Volume:
Time of Day:
If countermeasure is intersection-based
Intersection Type:Roadway/roadway (not interchange related)
Intersection Geometry:4-leg
Traffic Control:Signalized
Major Road Traffic Volume:Minimum of 3000 to Maximum of 77000 Annual Average Daily Traffic (AADT)
Minor Road Traffic Volume:Minimum of 1 to Maximum of 45500 Annual Average Daily Traffic (AADT)
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:
Municipality:
State:
Country:
Type of Methodology Used:Before/after using empirical Bayes or full Bayes
Other Details
Included in Highway Safety Manual?Yes
Date Added to Clearinghouse:Jan 01, 1970
Comments:

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