US Highway 23 (
US 23) is a
United States Numbered Highway that runs from
Jacksonville, Florida, to
Mackinaw City, Michigan. In the US state of
Michigan, it is a major, , north–south
state trunkline highway that runs through the
Lower Peninsula (LP). 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. Serving the cities of
Ann Arbor and
Flint, US 23 acts as a freeway bypass of the
Metro Detroit area. 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. 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.