CMF / CRF Details

CMF ID: 9856

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:0.95
Adjusted Standard Error:
Unadjusted Standard Error:0.32
Crash Reduction Factor (CRF)
Value:5  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:32
Applicability
Crash Type:All
Crash Severity:All
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
Traffic Volume:
Average Traffic Volume:21353 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):61 crashes before, 39 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.