CMF / CRF Details

CMF ID: 9886

Convert signalized intersection to multi-lane roundabout

Description:

Prior Condition:  Four Leg Signalized Intersection

Category: Intersection geometry

Study: Whether Conversion and Weather Matter to Roundabout Safety, , 2018

 
Star Quality Rating:3 Stars  [View score details]
Rating Points Total:102
Crash Modification Factor (CMF)
Value:0.8
Adjusted Standard Error:
Unadjusted Standard Error:0.151
Crash Reduction Factor (CRF)
Value:20  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:15.1
Applicability
Crash Type:All
Crash Severity:K (fatal),A (serious injury),B (minor injury),C (possible injury)
Roadway Types:All
Street Type:
Minimum Number of Lanes:4
Maximum Number of Lanes:4
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:Roadway/roadway (not interchange related)
Intersection Geometry:4-leg
Traffic Control:Roundabout
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:2006 to 2016
Municipality:Region of Waterloo
State:notusa
Country:Canada
Type of Methodology Used:Before/after using empirical Bayes or full Bayes
Sample Size (crashes):59 crashes before, 50 crashes after
Sample Size (sites):5 sites before, 5 sites after
Sample Size (site-years):135 site-years before, 101 site-years after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Mar 11, 2019
Comments: