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Montana's secondary system was established in 1942, [4] but secondary highways (S routes) were not signed until the 1960s. [1] S route designations first appeared on the state highway map in 1960 [5] and are abbreviated as "S-nnn". Route numbers 201 and higher are, with very few exceptions, exclusively reserved for S routes.
The passing of the Federal-Aid Highway Act of 1956 gave major funding to the department and required it to be greatly expanded. In 1957, the four districts were replaced with five districts. The department moved to a new Highway Complex in 1978. In 1991, the Highway Department was reorganized and became the Montana Department of Transportation.
The Interstate Highways in Montana are the segments of the Dwight D. Eisenhower National System of Interstate and Defense Highways owned and maintained by the Montana Department of Transportation (MDT) in the U.S. state of Montana. The state's Interstate highways, totaling 1,198 miles (1,928 km), were built between 1956 and 1988 at a cost of $1 ...
The secondary highway system is a lower-level classification of state highway maintained by the Montana Department of Transportation (MDT) in the US state of Montana. Secondary highways first appeared on the state highway map in 1960, [ 1 ] even though the secondary system was established in 1942. [ 2 ]
I-15 is additionally named as the First Special Service Force Memorial Highway from Helena to the Alberta border, where Alberta Highway 4 continues into Canada retaining that designation. I-15 joins with I-90 and makes a junction with a short, one-mile (1.6 km) spur route I-115 in Butte .
Montana has approximately 70,000 miles (110,000 km) of highways which start in, pass through or are entirely inside the state. [2]Prior to the creation of the state highway system and national numbered routes, a series of named auto trails traversed Montana and provided connections to other states.
Interstate 115 (I-115) is a 1.194-mile-long (1.922 km) auxiliary Interstate Highway which connects I-15/I-90 to Butte in the U.S. state of Montana. The highway is concurrent with I-15 Bus./I-90 Bus. for its entire length. The highway travels from an incomplete interchange with I-15/I-90 through generally rural areas in western Butte. It also ...
Interstate 94 (I-94) is an east–west Interstate Highway, which links Billings, Montana, to the Canada–US border in Port Huron, Michigan.The portion in the US state of Montana is 250 miles (400 km) long, linking seven counties through the central part of the state.