CMF / CRF Details

CMF ID: 9895

Change permissive left-turn phasing to protected only or protected/permissive

Description: Treatment group includes intersections where signal phases were changed from permissive to protected-only or protected/permissive.

Prior Condition: Intersections with permissive left-turn signal phasing.

Category: Intersection traffic control

Study: Safety Evaluation of Protected Left-Turn Phasing and Leading Pedestrian Intervals on Pedestrian Safety, Goughnour et al., 2018

 
Star Quality Rating: 4 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 1.025
Adjusted Standard Error:
Unadjusted Standard Error: 0.011
Crash Reduction Factor (CRF)
Value: -2.5   (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 1.1
Applicability
Crash Type: Other
Crash Severity: All
Roadway Types: All
Number of Lanes:
Road Division Type:
Speed Limit:
Area Type:
Traffic Volume:
Average Traffic Volume:
Time of Day: All
If countermeasure is intersection-based
Intersection Type: Roadway/roadway (not interchange related)
Intersection Geometry: Not specified
Traffic Control: Signalized
Major Road Traffic Volume: Minimum of 4355 to Maximum of 73697 Annual Average Daily Traffic (AADT)
Minor Road Traffic Volume: Minimum of 886 to Maximum of 47128 Annual Average Daily Traffic (AADT)
Average Major Road Volume : 32116 Annual Average Daily Traffic (AADT)
Average Minor Road Volume : 17109 Annual Average Daily Traffic (AADT)
Development Details
Date Range of Data Used: 2005 to 2014
Municipality: Toronto
State:
Country: Canada
Type of Methodology Used: Before/after using empirical Bayes or full Bayes
Sample Size (crashes): 11402 crashes before, 9317 crashes after
Sample Size (sites): 114 sites before, 114 sites after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Mar-11-2019
Comments: Crash Type = Vehicle-Vehicle Crashes