roundabout ariel view

Photo: Washtenaw County Road Commission

In this webinar, attendees learned how the Washtenaw County (Michigan) Road Commission (WCRC) constructs smaller-footprint roundabouts. Smaller roundabouts take less time to build, reduce impacts to adjacent property owners, and use fewer materials to construct. These three outcomes result in a cost savings ratio of two to one and sometimes up to three to one when compared to traditional-sized roundabouts. Building more roundabouts allows WCRC to save more lives and improve the quality of life in more communities through improved levels of service and enhanced safety. Preliminary data collected by WCRC indicates that with acceptance to given tradeoffs, smaller roundabouts have a bright future in North America on high-speed intersection approaches.

This presentation showcased the design, construction, and operations of various smaller roundabouts in Washtenaw County so other state and local government entities can implement similar outcomes in their communities. In addition, three MnDOT speakers joined the conversation to discuss information about mini-roundabouts and urban concepts.

Webinar Recording

Topics Covered

  • Why MnDOT is interested in smaller roundabouts
  • Michigan's experience¬†
  • The St. James project development and finished product experience¬†
  • Where Minnesota's small roundabouts are
  • What has been Minnesota's crash experience

Who Should Attend

This webinar is designed for engineers in the private and public sectors as well as professionals in academia.


  • Mark McCulloch, Washtenaw County Road Commission (Michigan), will share his involvement in the design and operations of smaller roundabouts in rural, high-speed applications.
  • Zak Tess, MnDOT District 7, will present on the City of St. James's roundabouts.
  • Derek Leuer, MnDOT state traffic safety engineer, will share information on installation locations and safety performance.
  • Doug Carter, MnDOT Geometric Design Support Unit (GDSU), will be on hand to answer questions.

More Information

For more information, contact Katherine Stanley at or 612-626-1023.


This webinar is presented by the Minnesota Local Technical Assistance Program (LTAP) at the Center for Transportation Studies, University of Minnesota. Minnesota LTAP is sponsored by the Minnesota Local Road Research Board (LRRB) and the Federal Highway Administration (FHWA). This course is subsidized through funding from LRRB and FHWA.