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M-231 is the designation of a state trunkline highway in the Lower Peninsula of the US state of Michigan that serves as a partial bypass to US Highway 31 (US 31) around Grand Haven. This highway was built south of Interstate 96 (I-96) as an additional crossing over the Grand River. The route runs from M-45 northward and across the river to a connection with I-96 near the current M-104 interchange. The Michigan Department of Transportation (MDOT) announced the proposed highway in early November 2006. The new corridor was funded through a Congressional appropriation and a state employment program. The Grand River bridge construction was originally planned for 2010 while the land for the project was being acquired. Other smaller bridges were included in the original plans. Roadway construction was scheduled for 2012. Recent developments in MDOT schedules had construction starting on the Grand River bridge after federal approval was secured with the remainder of the project deferred until additional funding is in place. The road opened on October 30, 2015, as a two-lane, limited-access expressway. ==Route description== M-231 begins along M-45 (Lake Michigan Drive) in Robinson Township near the intersection with 120th Avenue. It runs due north through a mix of farm fields and forest lands in Ottawa County.〔 The highway is a two-lane, limited-access highway.〔 The trunkline crosses North Cedar Drive on an overpass, and then it crosses the Grand River into Crockery Township. As it crosses the river, M-231 angles northeasterly before intersecting M-104 the latter's eastern terminus at I-96, and M-231 continues north to its own northern terminus at a new partial interchange with I-96. Even though it does not physically connect to that highway, M-231 is a scaled-down bypass of US 31 through Grand Haven. The highway is expected to reduce response times for emergency services in the area by shortening the driving distance across the Grand River.〔 The bridge over the river, including approaches over adjacent wetlands, is the seventh-longest in the state at and sits above the river. Seven other bridges along M-231 bring the total to nearly a mile (1.6 km) for the entire highway. The highway project included the construction of a non-motorized pathway parallel to the road. The path was built using funds from the Michigan Department of Transportation Alternative Program,〔 and it was designed as part of a collection of bike trails to connect the Lake Michigan shoreline with Grand Rapids and across the Grand River. The trail was dedicated on October 17, 2015, as the "Sgt. Henry E. Plant Memorial Grand River Bridge Non-Motorized Pathway", named for Ottawa County's first Medal of Honor recipient, Henry E. Plant, a veteran of the American Civil War. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「M-231 (Michigan highway)」の詳細全文を読む スポンサード リンク
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