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M-21 Rebuilding/Roundabout Project FAQs
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The project is scheduled to be let (bids received) in December 2028, with construction taking place approximately from April to November 2029.
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MDOT is currently working on designing the roundabout, including the pedestrian crossings. The crossings will connect with the existing shared-use path along Scott Road and will add new sidewalk to the east along State Street to connect to downtown. MDOT will continue to work with the City of St. Johns on this design.
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In the late 2010s, MDOT and the City of St. Johns had multiple discussions about the M-21/Scott Road intersection. There were concerns with speeding and visibility issues due to the geometry of the intersection. In 2021, the City of St. Johns voted to send a resolution of support to MDOT for a roundabout to be built at the intersection.
With the support of the city, MDOT completed a scoping report for a rebuilding project along M-21, including the construction of a roundabout. Additional funding for a roundabout was secured in 2024 due to operational and safety concerns at the intersection.
A roundabout at this intersection will improve safety and traffic flow. It will also serve as a clear gateway to St. John’s historic downtown.
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This location was studied for a traffic signal, which found that a traffic signal would not be justified at this location due to low traffic volumes.
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Yes, advisory speed signs will be posted below the advance roundabout signs. Additionally, the geometry of the approach legs will require vehicles to slow down as they maneuver to and through the roundabout.
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No. Access to nearby businesses will be maintained throughout construction. No businesses will be closed due to this project.
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The roundabout will be designed to accommodate semi-trucks. In addition to the circulating lanes, there will be a truck apron in the center island designed for interstate semi-trucks and trailers. The curb that runs along the inside of the roundabout island is a shorter-height mountable curb, which allows the rear tires of the truck's trailer to traverse onto the truck apron smoothly to minimize load shifts.
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Scott Road will experience both improved northbound and southbound traffic flow.
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MDOT will provide to the township and county website links and YouTube videos for general information about roundabouts. MDOT has created a project website that will also have these links posted for the public to view. MDOT also plans to hold an open house to inform the public about the project.
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No, traffic signals for pedestrian movements are not currently planned as part of this project. The department typically places enhancements for pedestrian crossings, such as laddered pavement markings with pedestrian yield signs to highlight where pedestrians are crossing.
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Yes, the splitter island of the approaches offers an area of refuge so that a pedestrian only needs to cross one direction of traffic at a time. Motorized traffic will be required to yield to pedestrians after they enter the crosswalk.