CMF / CRF Details

CMF ID: 6160

Conversion of stop-controlled intersection into multi-lane roundabout

Description:

Prior Condition:  four-leg intersection with stop control on minor

Category: Intersection geometry

Study: Public Opinion, Traffic Performance, The Environment, and Safety After the Construction of Double-Lane Roundabouts, Hu et al., 2014

 
Star Quality Rating:2 Stars  [View score details]
Rating Points Total:60
Crash Modification Factor (CMF)
Value:6.016
Adjusted Standard Error:
Unadjusted Standard Error:3.998
Crash Reduction Factor (CRF)
Value:-501.6  (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:399.8
Applicability
Crash Type:All
Crash Severity:O (property damage only)
Roadway Types:Not specified
Street Type:
Minimum Number of Lanes:2
Maximum Number of Lanes:2
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:Undivided
Minimum Speed Limit:50
Maximum Speed Limit:50
Speed Unit:mph
Speed Limit Comment:
Area Type:Not specified
Traffic Volume:
Average Traffic Volume:
Time of Day:All
If countermeasure is intersection-based
Intersection Type:Roadway/roadway (not interchange related)
Intersection Geometry:No values chosen.
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:2003 to 2007
Municipality:Bellingham
State:WA
Country:
Type of Methodology Used:Regression cross-section
Sample Size (crashes):76 crashes
Sample Size (sites):9 sites
Sample Size (site-years):63 site-years
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Mar 11, 2015
Comments:Multilane roundabout on a two-lane undivided roadway. The total entering volume was approximately 15,700 vehicles per day in the before period and 16,100 vehicles per day in the after period.