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*'''I-15''' runs north-south from Alberta, Canada through Western Montana to Idaho.
*'''I-90''' runs north from Sheridan, Wyoming to near Billings then runs west through Bozeman, Butte, and Missoula to Idaho.
*'''I-94''' runs from the North Dakota border west to join with I-90 just east of Billings.
A few US Highways provide mainline travel through interesting areas of the state.