CMF / CRF Details

CMF ID: 9868

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:2 Stars  [View score details]
Rating Points Total:35
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value:21  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
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 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:
Type of Methodology Used:Before/after using comparison group
Sample Size (crashes):202 crashes before, 141 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.