CMF / CRF Details

CMF ID: 11017

Install Texas U-Turn (Texas Turnaround)

Description: Texas U-turns allows vehicles traveling on a one-way frontage road to access the opposing direction one-way frontage road via a U-turn before the terminal intersections at the diamond interchange. This technique removes two potential left-turn maneuvers from the adjacent at-grade intersections.

Prior Condition:  No Prior Condition(s)

Category: Intersection geometry

Study: Safety Evaluation for Turnarounds at Diamond Interchanges: Assessing the Texas U-Turn, Dixon et al., 2018

Star Quality Rating:4 Stars  [View score details]
Rating Points Total:115
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:0.0782
Crash Reduction Factor (CRF)
Value:23.7  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:7.82
Crash Type:All
Crash Severity:All
Roadway Types:All
Street Type:
Minimum Number of Lanes:2
Maximum Number of Lanes:4
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:Divided by Median
Minimum Speed Limit:35
Maximum Speed Limit:55
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 (interchange ramp terminal)
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 2015
Type of Methodology Used:
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Nov 09, 2021
Comments:This CMF is for locations where the right-turn from the cross street originates from a shared lane and does not have a large turning radius or a raised island.