CMF / CRF Details

CMF ID: 11304

Install Median Opening Treatments at Unsignalized Intersections

Description: The median opening treatments covered in this countermeasure include: stop line, stop sign, and double yellow line; and yield lines and yield signs and double yellow line.

Prior Condition:  No median treatments

Category: Alignment

Study: Development of Crash Modification Factor for Low-cost Median Opening Treatments at Unsignalized Intersections of Rural Divided Highways, Priyanka, 2022

Star Quality Rating:2 Stars  [View score details]
Rating Points Total:40
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:0.22
Crash Reduction Factor (CRF)
Value:30  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:22
Crash Type:Left turn
Crash Severity:All
Roadway Types:Principal Arterial Other
Street Type:Two-Way
Minimum Number of Lanes:4
Maximum Number of Lanes:4
Number of Lanes Direction:Both Directions
Number of Lanes Comment:
Crash Weather:All
Road Division Type:Divided by Median
Minimum Speed Limit:55
Maximum Speed Limit:65
Speed Unit:mph
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:Other
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:2016 to 2020
Type of Methodology Used:
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Dec 12, 2023
Comments:This CMF is for unsignalized (stop-controlled and yield) intersections. All the study locations are on four-lane divided highways with left-turn bays on the major roads.