Well, I was wrong. I don't know if it's just because we're going through in the spring, but it is really a beautiful state! And we always thought Yellowstone Nat'l Park was in Montana. Nope. Most of it is in Wyoming. And the Tetons, although we did not go that far north.
Not having lived in an area that receives tremendous amounts of snow, we assumed that these were snow fences, meant to keep the snow from drifting onto Interstate 80.