CMF / CRF Details

CMF ID: 9907

Modify signal phasing (implement a leading pedestrian interval)

Description:

Prior Condition:  Signal phasing without leading pedestrian interval

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:5 Stars  [View score details]
Rating Points Total:140
Crash Modification Factor (CMF)
Value:0.83
Adjusted Standard Error:
Unadjusted Standard Error:0.06
Crash Reduction Factor (CRF)
Value:17  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:6
Applicability
Crash Type:All
Crash Severity:All
Roadway Types:All
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 and suburban
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 6650 to Maximum of 32363 Annual Average Daily Traffic (AADT)
Minor Road Traffic Volume:Minimum of 1850 to Maximum of 25883 Annual Average Daily Traffic (AADT)
Average Major Road Volume :16407 Annual Average Daily Traffic (AADT)
Average Minor Road Volume :8544 Annual Average Daily Traffic (AADT)
Development Details
Date Range of Data Used:2005 to 2014
Municipality:Chicago
State:IL
Country:
Type of Methodology Used:Before/after using empirical Bayes or full Bayes
Sample Size (crashes):217 crashes after
Sample Size (sites):9 sites before, 9 sites after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Mar 11, 2019
Comments:Crash Type = Total Crashes. This CMF is for sites where LPIs were implemented only for crossings across the minor road (parallel to the major road).