CMF / CRF Details

CMF ID: 10099

Add flashing green to signalized intersection

Description: This is one of the countermeasures to dilemma zone by adding a few seconds of flashing green phase to the signal before facilitate stop/go maneuvers.

Prior Condition: No Prior Condition(s)

Category: Intersection traffic control

Study: Safety Effectiveness Evaluation of Flashing Green Light at Urban Intersections, Valencia-Alaix et al., 2019

Star Quality Rating: Cannot Be Rated (Insufficient Information)
Crash Modification Factor (CMF)
Value: 0.77
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value: 23   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Type: All
Crash Severity: O (property damage only)
Roadway Types: Not specified
Number of Lanes:
Road Division Type:
Speed Limit:
Area Type: Urban
Traffic Volume:
Average Traffic Volume:
Time of Day: Not specified
If countermeasure is intersection-based
Intersection Type: Roadway/roadway (not interchange related)
Intersection Geometry:
Traffic Control: Signalized
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used: 2009 to 2016
Municipality: Medellin
Country: Colombia
Type of Methodology Used: Other before/after
Sample Size (sites): 85 sites before, 85 sites after
Sample Size (site-years): 680 site-years before, 680 site-years after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Jul-26-2019
Comments: CMF reported here is based on limited information from extended abstract.