CMF / CRF Details

CMF ID: 9853

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: 1.15
Adjusted Standard Error:
Unadjusted Standard Error: 0.7
Crash Reduction Factor (CRF)
Value: -15   (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 70
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: Suburban
Traffic Volume:
Average Traffic Volume: 10316 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:
State: IL
Country: USA
Type of Methodology Used: Before/after using comparison group
Sample Size (crashes): 7 crashes before, 3 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.