CMF / CRF Details

CMF ID: 9869

Coordinate arterial signals

Description: Coordination of traffic signals along an arterial cooridor

Prior Condition:  No coordination between arterial signals

Category: Intersection traffic control

Study: Identifying the Safety Impact of Signal Coordination Projects along Urban Arterials Using a Meta-analysis Method, Williamson et al., 2018

 
Star Quality Rating:1 Star  [View score details]
Rating Points Total:30
Crash Modification Factor (CMF)
Value:0.48
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value:52  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Applicability
Crash Type:All
Crash Severity: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 and suburban
Traffic Volume:Minimum of 10316 to Maximum of 25800 Average Daily Traffic (ADT)
Average Traffic Volume:17776 Average Daily Traffic (ADT)
Time of Day:All
If countermeasure is intersection-based
Intersection Type:
Intersection Geometry:
Traffic Control:
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:
Municipality:
State:IL
Country:USA
Type of Methodology Used:Before/after using comparison group
Sample Size (crashes):50 crashes before, 41 crashes after
Sample Size (sites):5 sites before, 5 sites after
Sample Size (site-years):5 site-years before, 5 site-years after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Nov 19, 2018
Comments:The CMF applies to all crashes along the corridor.Applies for both urban and suburban principal arterial-other and minor arterial.