CMF / CRF Details

CMF ID: 9866

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:25
Crash Modification Factor (CMF)
Value:2.24
Adjusted Standard Error:
Unadjusted Standard Error:1.08
Crash Reduction Factor (CRF)
Value:-124  (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:108
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:Suburban
Traffic Volume:
Average Traffic Volume:25800 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):8 crashes before, 13 crashes after
Sample Size (sites):1 sites before, 1 sites after
Sample Size (site-years):1 site-years before, 1 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 suburban principal arterial-other and minor arterial.