A concurrency in a road network is an instance of one physical roadway bearing two or more different route numbers. When two roadways share the same right-of-way, it is sometimes called a common section or commons. Other terminology for a concurrency includes overlap, coincidence, duplex, triplex, multiplex, dual routing or triple routing.
The South Carolina State Highway System is the fourth largest state-maintained system of state highways in the country. It consists of Interstates, U.S. highways, state highways, and secondary roads, totaling approximately 41,500 miles (66,800 km).
Montana Highway 81 (MT 81) is a state highway in the U.S. state of Montana. The highway begins at an intersection with MT 80 north of the hamlet of Arrow Creek. The highway extends eastward from this point for approximately 42 miles (68 km), ending at an intersection with U.S. Route 191 (US 191) at the post office of Brooks. The landscape traversed by MT 81 is uneven and largely rural, used mainly for agriculture and livestock grazing. For much of its length, the highway is roughly paralleled by the main line of Central Montana Rail, which is headquartered in Denton.
Montana Highway 2 (MT 2) is a 63.241-mile-long (101.777 km) state highway in the southern part of the U.S. state of Montana. It extends from Interstate 15 (I-15) and I-90 in Butte to I-90 in Three Forks. Previously, this roadway was a part of U.S. Route 10 (US 10).
Highway 84 is a 28.904-mile-long (46.516 km) east–west state highway in the U.S. State of Montana. MT 84's western terminus is at U.S. Route 287 in the small community of Norris and the eastern terminus is at US 191 and MT 85 at Four Corners. The highway's eastern terminus, about 7 miles (11 km) west of Bozeman, is a location known locally as "Four Corners." From Four Corners, US 191 runs east to Bozeman, and south to West Yellowstone; Highway 84 travels west to Norris; and Montana Highway 85 runs north to Belgrade.
Montana Highway 82 (MT 82) is a state highway in the U.S. state of Montana connecting U.S. Highway 93 (US 93) north of Somers to MT 35 north of Bigfork.
Montana Highway 87 (MT 87) is a primary state highway in Madison County in Montana, United States. The highway travels through mainly rural areas in Raynolds Pass, from the Montana–Idaho state line to an intersection with U.S. Route 287 (US 287). The route travels through a portion of Gallatin National Forest. In 1922, a road in the location of MT 87 was added to the highway system, and a few years later the road was designated as portions of two early auto trails. In 1959, the route was rapidly improved due to the collapse of US 287 nearby. During 1967, much of the highway was reconstructed along its current location.
Montana Highway 80 is a 67.172-mile-long (108.103 km) north–south state highway in the U.S. State of Montana. MT 80's southern terminus is at U.S. Route 87, MT 3 and MT 200 in the community of Stanford and the northern terminus is at US 87 in the town of Fort Benton. The landscape is hilly and rural, and largely used for wheat farming; the road also passes through Arrow Creek Canyon and near the Highwood Mountains. Between Arrow Creek and Geraldine, MT 80 is roughly paralleled by the main line of Central Montana Rail.
Montana Highway 78 in the U.S. state of Montana is a state highway running in a northerly direction from an intersection with U.S. Highway 212 (US 212) at the city of Red Lodge. It runs through Roscoe and Absarokee. The highway extends about 49 miles (79 km) to a northern terminus at Interstate 90 (I-90) in the town of Columbus.
Montana Highway 72 in the U.S. State of Montana is a route running northerly from the Wyoming state line to an intersection with U.S. Route 310 about one mile (1.6 km) south of the town of Bridger, a distance of approximately 21 miles (34 km). At the state line, the road becomes Wyoming Highway 120, which continues 38 miles (61 km) to the town of Cody.
Montana Highway 69 (MT 69) is a route running northerly from an intersection with MT 55 in the community of Whitehall. The highway extends approximately 38 miles (61 km) to an intersection with Interstate 15 (I-15) at the northern edge of the town of Boulder. Most of the route follows the Boulder River valley, a scenic and relatively unspoiled rural landscape.
Montana Highway 66 is a 50-mile-long (80 km) state highway in the US state of Montana. It begins at an intersection with U.S. Highway 191 in far southwestern Phillips County and runs northerly to the town of Fort Belknap in Blaine County. Approximately 40 miles (64 km) of the northern end of the route is within the boundaries of the Fort Belknap Indian Reservation, running through the bulk of its territory.
U.S. Route 287 (US 287) is a north-south United States Numbered Highway in the state of Montana. It extends approximately 281.2 miles (452.5 km) from Yellowstone National Park north to U.S. Route 89 in Choteau, 100 miles (160 km) south of the Canadian border.
Transportation in Montana comprises many different forms of travel. Montana shares a long border with Canada, hence international crossings are prevalent in the northern section of the state; there are 13 road crossings and one rail crossing.
Montana Highway 287 is a state highway in the U.S. state of Montana. The highway runs 42.822 miles (68.915 km) from MT 41 in Twin Bridges east to U.S. Route 287 in Ennis. MT 287 is the primary east–west highway of Madison County. The highway connects the county's four towns, including Sheridan and the county seat of Virginia City. The course of MT 287 follows the ultimate portions of two trails that met in Virginia City, the center of the Alder Gulch gold rush of the mid-1860s and the second territorial capital of Montana. Parts of the highway were improved from rudimentary roads around 1920 from Virginia City to Ennis. This connection became the first portion of Montana Highway 34 in the early 1930s; the highway was extended west to Twin Bridges in the late 1930s. MT 34 was reconstructed from Twin Bridges through Alder to Virginia City in the late 1930s and early 1940s and between Virginia City and Ennis in the late 1940s to mid-1950s. The MT 287 designation was first applied to a cross-state route from West Yellowstone to Canada in the late 1950s. The highway was rerouted in place of MT 34 in the early 1960s. MT 287 was replaced by US 287 along much of the cross-state corridor in the mid-1960s. The highway extended north of Twin Bridges to Whitehall until the late 1970s, when it achieved its current length.
Montana Highway 135 (MT 135) is a 21.5-mile-long (34.6 km) state highway in western Montana. It begins at Interstate 90 (I-90) in St. Regis and ends at MT 200 near Paradise. The highway runs along the bank of the Clark Fork River and through Lolo National Forest.
Montana Highway 28 (MT 28) is an approximately 46.7-mile-long (75.2 km) state highway in the west of the US state of Montana. It begins at MT 200 in Plains and ends at U.S. Highway 93 (US 93) in Elmo; all but the first 7.5 miles (12.1 km) are within the Flathead Indian Reservation. It serves as a key link in two alternate routes between Spokane, Washington, and Kalispell.
Montana Highway 77 (MT 77), also known as Hot Springs Road, is an approximately 1.99-mile-long (3.20 km) state highway in the west of the US state of Montana, and it is a spur route to connect MT 28 to the city of Hot Springs. The entire route is within the Flathead Indian Reservation.
