High Quality Content by WIKIPEDIA articles! 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 362.33-mile (583.11 km) 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. The non-freeway section was designated the Sunrise Side Coastal Highway by the Michigan Department of Transportation (MDOT) in 2004 as a part of the Michigan Heritage Route program. Serving the cities of Ann Arbor and Flint, US 23 acts as a freeway bypass of the Metro Detroit area. The section from Flint north to Standish also carries Interstate 75 (I-75) including a segment that carries almost 70,000 vehicles on a daily basis.