CMF / CRF Details

CMF ID: 6159

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]
Crash Modification Factor (CMF)
Value: 0.004
Adjusted Standard Error:
Unadjusted Standard Error: 50.561
Crash Reduction Factor (CRF)
Value: 99.6   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 5056.1
Applicability
Crash Type: All
Crash Severity: K (fatal),A (serious injury),B (minor injury),C (possible injury)
Roadway Types: Not specified
Number of Lanes: 2
Road Division Type: Undivided
Speed Limit: 50
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): 86 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.