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M-139 (Michigan highway)
M-139 is a state trunkline highway entirely within Berrien County in the US state of Michigan. The highway starts at US Highway 12 (US 12) southwest of Niles and runs through rural areas of the county to terminate at an intersection with Business Loop Interstate 94 (BL I-94) in Benton Harbor. The highway run parallel to, and crosses over, the St. Joseph River several times as it follows a set of roads previously used for US 31 in the area. The highway was first designated in the 1930s as a bypass of the Benton Harbor and St. Joseph area. Its termini have been moved over the years since, extending and contracting the length of the highway between Niles and Benton Harbor. M-139 now serves to provide access through the area from a set of bypasses consisting of I-94 and US 31.
==Route description==
M-139 begins at a junction with US 12 southwest of Niles in Bertrand Township. The highway travels northeasterly along Chicago Road through farm fields and residential neighborhoods. The trunkline turns north along Lincoln Avenue and then east on Main Street to run into downtown Niles. Main Street crosses the St. Joseph River, and at the intersection with Front Street, M-139 turns north along that street which is also called "OLD US 31" on some maps. The highway runs parallel to the river as both exit the downtown area. M-139 turns toward the northwest on the outskirts of town, running through farm fields. The trunkline passes Webster and Long lakes as it crosses mixed forest and residential areas between Niles and Berrien Springs.〔〔
Entering Berrien Springs, M-139 curves around part of Lake Chapin. North of the dam that forms Lake Chapin from the St. Joseph River, the highway follows Ferry Street to the southwest to cross the river. In downtown Berrien Springs, the trunkline then turns northwesterly along St. Joseph Avenue to pass Andrews University. Northwest of the college, M-139 crosses US 31 (St. Joseph Valley Parkway). From there the highway travels northwesterly through Royalton Township through farm fields parallel to the St. Joseph River. M-139 follows Niles Road to the community of Scottdale where it turns northward along Scottdale Road at an intersection with M-63. M-139 crosses the St. Joseph River one last time south of the interchange with I-94 at its exit 28; M-139 then passes through the community of Fair Plain and enters the eastern edge of Benton Harbor. Before terminating at BL I-94 (Main Street) in Benton Harbor, the highway splits into a one-way pair just north of Empire Avenue. Northbound traffic is routed along Martin Luther King Drive while southbound traffic flows on Fair Avenue.
M-139 is maintained by the Michigan Department of Transportation (MDOT) like other state highways in Michigan. As a part of these maintenance responsibilities, the department tracks the volume of traffic that uses the roadways under its jurisdiction. These volumes are expressed using a metric called annual average daily traffic, which is a statistical calculation of the average daily number of vehicles on a segment of roadway. MDOT's surveys in 2011 showed that the highest traffic levels along M-139 were the 12,248 vehicles daily between the intersections with Fairland and Deans Hill/Pokagon roads south of Berrien Springs; the lowest counts were the 1,576 vehicles per day in downtown Niles. The only section of M-139 that have been listed on the National Highway System (NHS) is from the interchange with US 31 northward. The NHS is a network of roads important to the country's economy, defense, and mobility.
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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