CMF / CRF Details

CMF ID: 11307

Install Offset Left-Turn Lanes and Flashing Yellow Arrow (FYA) Signals


Prior Condition:  Signalized Intersection without Offset Left-Turn Lanes

Category: Intersection geometry

Study: Safety Evaluation of Offset Left-Turn Lanes and FYA Signals at Signalized Intersections on Multi-lane Divided Highways in Alabama, Biswas et al., 2023

Star Quality Rating:Cannot Be Rated (Insufficient Information)
Rating Points Total:0
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value:30  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Type:All
Crash Severity:All
Roadway Types:All
Street Type:Two-Way
Minimum Number of Lanes:4
Maximum Number of Lanes:
Number of Lanes Direction:Both Directions
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:Divided by Median
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:Not specified
Traffic Volume:
Average Traffic Volume:
Time of Day:All
If countermeasure is intersection-based
Intersection Type:Roadway/roadway (not interchange related)
Intersection Geometry:4-leg
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:2010 to 2020
Type of Methodology Used:
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Dec 12, 2023