Highway 5

Scobey to Langdon is state highways, with shared numbering. On streetview it is 2 lane chipseal across the flattest parts of these 2 states. Towns are fewer and smaller than along US2 to the south.

There's a much discussed US2 across those states. There isn't a federal 5 in that area - I5 is NS on the west coast. US5, if it exists, would on the east coast.

Looks like it goes from Scobey in NE, MT to Langdon in NE, ND. Doesn't continue on into MN.

You can Google each state for a listing of current road conditions.