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: 2 Stars   [View score details]
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
Number of Lanes:
Road Division Type:
Speed Limit:
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.