I guess you will run I-90 across the top thru ID.
If so the only place where there might be a problem is with the traffic thru and between Spokane, WA. and Coeur d' Alene, ID.
Mount Baker tunnel.
Lacey V. Murrow bridge.
Homer M. Hadley bridge.
Snoqualmie Pass @ just over 3000 ft.
Lookout Pass on the border of Idaho and Montana @ 4700 ft.
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