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U.S. Route 23 in Michigan
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.
The first transportation routes along what is now US 23 in the state were sections of two Indian trails. The route of what is now US 23 follows portions of two separate trails. In the early 20th century, four different auto trail names were applied to roads now a part of the highway. These roads were included as part of two state highways in the initial state highway system in 1919. 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. Since creation, the road has been moved and realigned several times. 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. Starting in the early 1950s, various sections in the southeastern and central areas of the LP were upgraded to freeways, bypassing several major cities in the area. These improvements were completed by the end of the 1960s. 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.
Various memorial or tourist route designations have been applied to US 23 in the state since the 1980s. The highway has been a part of the Lake Huron Circle Tour since the creation of the Great Lakes Circle Tours in 1986. 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. Since 2009, it has been called the Huron Shores Heritage Route. The highway has also carried two memorial designations related to war veterans and a third related to local civic leaders since a 2001 consolidation of related legislation in the state. MDOT has listed two of the highway's bridges on its historic bridge list, one of which is also on the National Register of Historic Places (NRHP). Future improvements to the route of US 23 include a proposed northerly extension of the freeway from Standish to one of several locations along the Lake Huron shoreline. Another freeway has been proposed in the Flint area that could connect US 23 directly to the south end of I-475.
==Route description==
US 23 runs for through the LP of Michigan, serving as a freeway bypass to the west of Metro Detroit and a scenic highway through the northern portion of the state along Lake Huron. Between Flint and Standish, US 23 runs concurrently with I-75;〔 the combined freeway section from Flint to Bay City can contain between six and eight lanes total while the rest of the US 23 freeway is mostly four lanes. Non-freeway segments of US 23 in the state are two lanes.〔 Like other state trunkline highways, it is maintained by the Michigan Department of Transportation (MDOT). All of US 23 in the state south of the M-32 junction in Alpena has been listed on the National Highway System, a network of roads important to the country's economy, defense, and mobility. From the Standish area north, the highway is also a part of the Lake Huron Circle Tour and the Huron Shores Heritage Route, a Pure Michigan Byway.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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