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Transforming Safety: Scott County’s Roundabout Success on Highway 13 and County Road 2

The intersection at State Highway 13 and County Road 2 in Scott County, Minnesota, experienced alarming statistics with 2 fatal crashes and 50 injury crashes from June 2000 to June 2005. After failed attempts to mitigate these issues with signs and flashing lights, MnDOT implemented a single-lane roundabout in 2005. This design led to remarkable safety improvements, including a 100% reduction in angle crashes and a 76.2% decrease in total crashes per year. This case highlights the benefits of roundabouts in enhancing intersection safety.

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Transforming Safety: Scott County’s Roundabout Success on Highway 13 and County Road 2

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  1. Minnesota Roundabout A Scott County Success Story FHWA-SA-09-013

  2. The Challenge The intersection of StateHighway 13 and County Road 2 in Scott County, Minnesota, was the site of 2 fatal crashes and 50 injury crashes between June 2000 and June 2005. Minnesota Department of Transportation (Mn/DOT) tried several treatments, including larger stop signs, striping, and flashing lights, with little success. Mn/DOT sought to reduce the number and severity of crashes at this two-way stop-controlled intersection.

  3. Solution Single Lane Roundabout: 4 approach lanes 1 circulatory lane Central Island diameter of 110 feet Approach lane widths of 16 feet Departure lane widths of 14 feet 200-foot long median on County Road 2 300-foot long median on State Highway 13 25 feet wide splitter islands 10 feet wide truck apron Transverse rumble strips placed 20 feet center-to-center on apron

  4. Technical Data Location: County Road 2 and State Highway 13, Scott County, MN Speed Limits: Both County Road 2 and Highway 13 have a posted speed limit of 55 mph Average Daily Traffic (ADT): County Road 2 - 4,300 Highway 13 – 4,650 Construction Cost: $725,000 Construction Time: Constructed in 2005 and lasted for 3 months Implementation Issues: MnDOT experienced no implementation issues withthe roundabout

  5. Results Average Crash Reductions: 100% reduction in angle crashes per year 78.7% reduction in injury crashes per year 76.2% reduction in total crashes per year

  6. For More Information Visit FHWA’s intersection safety web site to download this and other case studies highlighting proven intersection safety treatments from across the country: http://safety.fhwa.dot.gov/intersection/ Or Contact: Anthony J. Winiecki, P.E., PTOE Scott County Public Works Department, Jordan, MN Phone: (952) 496-8346 E-mail: twiniecki@co.scott.mn.us Ed Rice Office of Safety (HSSD) Federal Highway Administration Phone: (202) 366-9064 E-mail: ed.rice@dot.gov

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