CMF / CRF Details

CMF ID: 9403

Convert intersection with minor-road stop control to modern roundabout

Description:

Prior Condition:  Intersection with stop-control on the minor roadway.

Category: Intersection geometry

Study: Safety of Roundabout: The Details Matter, Sun et al., 2018

 
Star Quality Rating:3 Stars  [View score details]
Rating Points Total:95
Crash Modification Factor (CMF)
Value:0.28
Adjusted Standard Error:
Unadjusted Standard Error:0.054
Crash Reduction Factor (CRF)
Value:72  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:5.4
Applicability
Crash Type:All
Crash Severity:All
Roadway Types:Not specified
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:
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:Urban and suburban
Traffic Volume:
Average Traffic Volume:
Time of Day:All
If countermeasure is intersection-based
Intersection Type:
Intersection Geometry:3-leg,4-leg
Traffic Control:Stop-controlled
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:
Municipality:
State:LA
Country:United States
Type of Methodology Used:Before/after using empirical Bayes or full Bayes
Sample Size (crashes):124 crashes before, 37 crashes after
Sample Size (sites):5 sites before, 5 sites after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Oct 27, 2018
Comments:This CMF is for converting 3- or 4-leg minor stop control intersections to roundabout.