Which is the only US state that has a highway prohibiting automotive traffic?

I remembered that cars aren’t allowed on the island because a friend of mine visited the island because her favorite movie is Somewhere in Time with Jane Seymour and Christopher Reeve.

jansiepansy, It is Mackinac.....

Player #2215509, macinaw island

Player #2215509, yes the whole island prohibits automobiles.

I refuse to use majority vote until the coin amount is lowered.