M-23 (Michigan highway)
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M-23 was an early designation (from the 1910s) for the east-west highway in southern Michigan that became US 112 when the US Highway system came into existence in the mid-1920s. It extended from the Michigan/Indiana state line just north of Elkhart, Indiana, going due north for about two miles and turned eastward. At Ypsilanti, Michigan it had its eastern terminus, meeting what was then M-17 (which would become U.S. Highway 12 from 1926 to 1961). Most of it became what is now US 12 in southern Michigan when US 112 was decommissioned in 1962. At Ypsilanti, Michigan it had its eastern terminus, meeting what was then M-17 (which would become US 12 from 1926 to 1961).
The designation became superfluous as the U.S. Highway system was introduced in Michigan, and the highway even crossed what would become US 23 in Saline, Michigan. A bridge (now closed to vehicular traffic) west of Coldwater, Michigan has a plaque indicating that the route that used that bridge was originally designated M-23.
Michigan has not used markers for M-23 since the 1920s apparently to avoid any confusion with US 23.
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