CMF / CRF Details

CMF ID: 5555

Install J-Turn intersection

Description: Install J-Turn intersection

Prior Condition:  Two way stop controlled intersection

Category: Intersection geometry

Study: Evaluation of J-turn Intersection Design Performance in Missouri, Edara et al., 2013

Star Quality Rating:3 Stars  [View score details]
Rating Points Total:75
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value:34.8  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Type:All
Crash Severity:All
Roadway Types:Principal Arterial Other Freeways and Expressways
Street Type:
Minimum Number of Lanes:
Maximum Number of Lanes:
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:Divided by Median
Minimum Speed Limit:65
Maximum Speed Limit:70
Speed Unit:mph
Speed Limit Comment:
Area Type:Rural
Traffic Volume:
Average Traffic Volume:
Time of Day:All
If countermeasure is intersection-based
Intersection Type:Roadway/roadway (not interchange related)
Intersection Geometry:3-leg,4-leg
Traffic Control:Other
Major Road Traffic Volume:Minimum of 10326 to Maximum of 26470 Annual Average Daily Traffic (AADT)
Minor Road Traffic Volume:Minimum of 434 to Maximum of 1389 Annual Average Daily Traffic (AADT)
Average Major Road Volume :16309 Annual Average Daily Traffic (AADT)
Average Minor Road Volume :755 Annual Average Daily Traffic (AADT)
Development Details
Date Range of Data Used:2004 to 2013
Type of Methodology Used:Before/after using empirical Bayes or full Bayes
Sample Size (crashes):86 crashes before, 27 crashes after
Sample Size (sites):5 sites before, 5 sites after
Sample Size (site-years):15 site-years before, 11 site-years after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Aug 12, 2014