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Since 2009, it has been called the Huron Shores Heritage Route. The non-freeway section was designated the Sunrise Side Coastal Highway by the Michigan Department of Transportation (MDOT) in 2004 as a part of what is now the Pure Michigan Byway Program. The highway has been a part of the Lake Huron Circle Tour since the creation of the Great Lakes Circle Tours in 1986. Various memorial or tourist route designations have been applied to US 23 in the state since the 1980s. Since then a new crossing of the Saginaw River at Zilwaukee was built to replace a drawbridge that carried the I-75/US 23 freeway over a shipping channel. These improvements were completed by the end of the 1960s. Starting in the early 1950s, various sections in the southeastern and central areas of the Lower Peninsula were upgraded to freeways, bypassing several major cities in the area. Through the 1930s and 1940s, the lakeshore routing was created to replace a path that ran further inland through the northern portion of the state. Since creation, the road has been moved and realigned several times. When the United States Numbered Highway System was first designated on November 11, 1926, the new US 23 replaced the other designations along its route. These roads were included as part of two state highways in the initial state highway system in 1919. In the early 20th century, four different auto trail names were applied to roads now a part of the highway.
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The route of what is now US 23 follows portions of two separate trails. The first transportation routes along what is now US 23 in the state were sections of two Indian trails. The section from Flint north to Standish also carries Interstate 75 (I-75) along a concurrency that includes a segment that carries almost 70,000 vehicles on a daily basis. Overall, the highway runs through rural areas of the state dominated by farm fields or woodlands some segments are urban in character in the Ann Arbor, Flint and Tri-Cities areas. Serving the cities of Ann Arbor and Flint, US 23 acts as a freeway bypass of the Metro Detroit area.
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The trunkline is a freeway from the Michigan– Ohio state line near Lambertville to the city of Standish, and it follows the Lake Huron shoreline from there to its northern terminus. In the US state of Michigan, it is a major, 362-mile-long (583 km), north–south state trunkline highway that runs through the Lower Peninsula. US Highway 23 ( US 23) is a north–south United States Numbered Highway that runs from Jacksonville, Florida, to Mackinaw City, Michigan. Michigan State Trunkline Highway System.Map of Detroit Metropolitan Wayne County Airport in Michigan, satellite detailed map, street view with approach roads and places to visit in Detroit Metropolitan Wayne County Airport.Monroe, Washtenaw, Livingston, Genesee, Saginaw, Bay, Arenac, Iosco, Alcona, Alpena, Presque Isle, Cheboygan, Emmet
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