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FHWA Highway Safety Programs

Minnesota Roundabout - A Scott County Success Story

Publication Year:

Original publication: Minnesota Roundabout - A Scott County Success Story (FHWA-SA-09-013) (PDF, 587kB)

Two fatal crashes and 50 injury crashes occurred in a five-year period at the rural, two-way stop, high-speed intersection of Highway 13 and County Road 2 in Minnesota. Attempts to reduce crash frequency with a variety of safety treatments at the intersection (including larger stop signs, striping, and flashing lights) were relatively unsuccessful.

The Minnesota Department of Transportation (Mn/DOT) sought to reduce crashes by converting the two-way stop controlled intersection to a single-lane roundabout. The roundabout was constructed with a central island 110 feet in diameter.

""Photo of the roundabout installed at the intersection of Highway 13 and County Rd 2 in Scott County, MN
Figure 1:   Intersection of State Highway 13 and County Road 2
Photo by Jody K. Hassel (used with permission)

 

"Diagram showing the eight potential vehicle conflict points on a standard two-lane roundabout"
Figure 2:   Eight vehicle conflict points
Source: FHWA Roundabouts: An Informational Guide

 

 

""Diagram showing the 32 potential vehicle conflict points on a standard two-lane roundabout
Figure 3:   32 vehicle conflict points
Source: FHWA Roundabouts: An Informational Guide

 

Key Accomplishments

The Minnesota Department of Transportation (Mn/DOT) sought to reduce crashes by converting the two-way stop controlled intersection to a single-lane roundabout. The roundabout was constructed with a central island 110 feet in diameter.

Results

Converting this intersection to a roundabout resulted in a 76.2 percent reduction in total crashes and a 78.7 percent reduction in injury crashes. Angle crashes were eliminated.

Contact

Anthony Winiecki
Scott County Public Works Department
Jordan, MN
336-747-6867
twiniecki@co.scott.mn.us