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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 state's Interstate highways, totaling 1,198 miles (1,928 km), were built between 1956 and 1988 at a cost of $1.22 billion. 95 percent of the system serves rural areas, the highest proportion of any state under Interstate program. [1] The entire Interstate system in Montana was designated as the Purple Heart Trail in 2003. [2]
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
The route has remained mostly unchanged from its original routing, except to expand lanes or straighten and widen some narrow sections. The most notable reroutings from the original corridor are: 1) the section from Moyie Springs, Idaho, to just inside the Montana border, which once ran much further north, as seen on the 1937 map of the area [3] (Old US 2N intersects today's US 2 about 2.6 ...
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.
I-15, 20 miles (32 km) south of Dillon, Montana I-15 (foreground left to right) goes through the city of Great Falls, MT. I-15 crosses into Montana from Idaho just south of Lima Reservoir over Monida Pass, at 6,870 feet (2,090 m), the highest elevation on the entire route of I-15. [2]
U.S. Highway 191 (US 191) is a north-south United States Numbered Highway in the state of Montana. It extends approximately 442.2 miles (711.7 km) from Yellowstone National Park north to the Canadian border .
U.S. Highway 89 (US 89) is a north-south United States Numbered Highway in the state of Montana. It extends approximately 400.5 miles (644.5 km) from Yellowstone National Park north to the Canadian border. US 89 is an important tourist route within Montana as it connects Yellowstone National Park and Glacier National Park.