CMF / CRF Details

CMF ID: 10384

Convert intersection to restricted crossing U-turn (RCUT) intersection

Description: The RCUT, also referred to as the superstreet intersection or J-turn intersection. The conversion is for either signalized or stop-controlled.

Prior Condition:  Both signalized and stop-controlled intersections

Category: Intersection geometry

Study: Investigating Safety Impact of Center Line Rumble Strips, Lane Conversion, Roundabout and J-Turn Features on Louisiana Highways, Sun and Rahman, 2019

 
Star Quality Rating:4 Stars  [View score details]
Rating Points Total:110
Crash Modification Factor (CMF)
Value:0.42
Adjusted Standard Error:
Unadjusted Standard Error:0.163
Crash Reduction Factor (CRF)
Value:58  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:16.3
Applicability
Crash Type:All
Crash Severity:All
Roadway Types:Not specified
Street Type:
Minimum Number of Lanes:4
Maximum Number of Lanes:6
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:Divided by Median
Minimum Speed Limit:55
Maximum Speed Limit:
Speed Unit:mph
Speed Limit Comment:> = 55 mph
Area Type:All
Traffic Volume:
Average Traffic Volume:
Time of Day:Not specified
If countermeasure is intersection-based
Intersection Type:Roadway/roadway (not interchange related)
Intersection Geometry:No values chosen.
Traffic Control:
Major Road Traffic Volume:Minimum of 59833 to Maximum of 59833 Annual Average Daily Traffic (AADT)
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:2008 to 2016
Municipality:
State:LA
Country:USA
Type of Methodology Used:Before/after using empirical Bayes or full Bayes
Sample Size (crashes):21 crashes before, 8 crashes after
Sample Size (sites):2 sites before, 2 sites after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Jun 01, 2020
Comments:CMF partial RCUT with 2 minor streets. Crashes for RCUT section (including U-turns). SPF used for this analysis came from the 2010 HSM