CMF / CRF Details

CMF ID: 365

Replace direct left-turn with right-turn/U-turn


Prior Condition:  No Prior Condition(s)

Category: Access management

Study: Right Turns Followed by U-Turns Versus Direct Left Turns: A Comparison of Safety Issues, Xu, 2001

Star Quality Rating:3 Stars  [View score details]
Rating Points Total:75
Crash Modification Factor (CMF)
Adjusted Standard Error:0.25
Unadjusted Standard Error:0.05
Crash Reduction Factor (CRF)
Value:33  (This value indicates a decrease in crashes)
Adjusted Standard Error:25
Unadjusted Standard Error:5
Crash Type:Angle
Crash Severity:All
Roadway Types:Principal Arterial Other
Street Type:
Minimum Number of Lanes:6
Maximum Number of Lanes:6
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:Not Specified
Traffic Volume:
Average Traffic Volume:
Time of Day:
If countermeasure is intersection-based
Intersection Type:Roadway/roadway (not interchange related)
Intersection Geometry:Not Specified
Traffic Control:Stop-controlled
Major Road Traffic Volume:
Minor Road Traffic Volume:Minimum of 0 to Maximum of 34000 Annual Average Daily Traffic (AADT)
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:
Type of Methodology Used:Non-regression cross-section
Other Details
Included in Highway Safety Manual?Yes. HSM lists this CMF in italics font to indicate that it has a lower reliability than bold font CMFs since it has an adjusted standard error of 0.2 to 0.3.
Date Added to Clearinghouse:Dec 01, 2009