CMF / CRF Details

CMF ID: 9789

Conversion of intersection into multi-lane roundabout

Description: Conversion of intersection into multi-lane roundabout.

Prior Condition:  Traffic circle

Category: Intersection geometry

Study: Crash Modification Factors Based on Crash Histories of 148 Modern Roundabouts in Five States, Zhang and Wang, 2017

 
Star Quality Rating:1 Star  [View score details]
Rating Points Total:25
Crash Modification Factor (CMF)
Value:3.06
Adjusted Standard Error:
Unadjusted Standard Error:0.79
Crash Reduction Factor (CRF)
Value:-206  (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:79
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:Not specified
Traffic Volume:
Average Traffic Volume:
Time of Day:Not specified
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:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:2005 to 2013
Municipality:
State:FL,IN,NY,PA,WA
Country:USA
Type of Methodology Used:Simple before/after
Sample Size (crashes):60 crashes before, 245 crashes after
Sample Size (sites):1 sites before, 1 sites after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Oct 27, 2018
Comments:Traffic circle to multi-lane roundabout