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: 4 Stars   [View score details]
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
Number of Lanes:
Road Division Type:
Speed Limit:
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).