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)
Rating Points Total:
Crash Modification Factor (CMF)
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
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:
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
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.