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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".
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 U.S. Highways in Montana are the segments of the United States Numbered Highway System owned and maintained by the Montana Department of Transportation (MDT) in the U.S. state of Montana. Mainline highways
U.S. Highway 2 (US 2) is an east–west United States Numbered Highway in the state of Montana. It extends approximately 666.645 miles (1,072.861 km) from the Idaho state line east to the North Dakota state line.
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.
1,198.8 miles (1,929.3 km) of the Interstate Highway System, which serve as a thoroughfare for long-distance road journeys, is contained within Montana, and all of these are maintained by the Montana Department of Transportation (MDT). Speed limits are generally 80 mph (130 km/h) in rural areas and 65 mph (105 km/h) in urban areas.
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 .
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]