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: 5 Stars
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
Number of Lanes:
Road Division Type:
Speed Limit:
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:
Comments: