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)
Value: 0.652
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
State: MO
Country: USA
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