community of Columbiaville just south of the M-90 junction. South of the Tuscola County line, the trunkline passes the Greenbriar Golf Club and crosses the Pere Marquette Railroad before turning west along Saginaw Road into the community of Mayville and turning north along Mertz Road. South of Caro, M-24 meets M-46. Once past Frank Street in Caro, M-24 becomes Ellington Street. M-24 then comes to meet M-81 in Caro, where the highway becomes Cleaver Road. M-24 then jogs west along Biebel Road and then north along Unionville Road past a junction with M-138 to end in Unionville at M-25. M-24 is also known locally as Lapeer Road in several areas, including Orion Township, Oxford Township, and Metamora. In the Village of Oxford, it is also known as Washington Street. In downtown Lapeer, it is known as Main Street, and north of Mayville as Mertz Rd. In the Unionville area, it is also known as Unionville Road. History Original designation In 1919, the first M-24 was designated along today's M-20. From Midland east, M-24 continued along today's M-47. When the U.S. Highway System was created, US 10 replaced M-20 and M-20 in turn replaced the first M-24. The M-24 designation was then applied to the current routing. Current designation The current designation was assigned in two pieces, Pontiac to Lapeer and Vassar to Bay City. The two sections would be joined in 1927 by a concurrency along M-21 and M-15. This arrangement lasted until a permanent solo routing was created in 1930. The Pontiac area saw a rerouting of M-24 to an eastern bypass of town in 1936. The former routing in town became M-24A. It would be redesignated as BUS M-24 in 1940 when the State Highway Department debuted business routes in Michigan. The northern terminus was moved to M-81 in Caro in 1942, and the southern terminus was shifted to the present location in 1963. Prior to a 1997 extension, M-24 ended at M-81 in Caro; now it continues up to M-25 in Unionville. From 2006 to 2008, M-24 was expanded to a boulevard between Metamora and Lapeer. There is still a two lane section between the Lapeer/Oakland County Line and Metamora that is planned to be upgraded in the near future. The construction has been delayed because of development close to the highway near Metamora. Major intersections See also References External links M-24 at Michigan Highways 024 Transportation