-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.
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