Yes it's a tunnel in Zion National Park. I've driven through it many times. Two lanes of traffic, each going opposite directions. No dividing barrier, so I always worry about colliding with either the wall or oncoming traffic. It isn't well lit but there are occasional openings in the wall where they dumped the rock out while they were tunneling. The Zion-Mt. Carmel Tunnel was completed in 1930 and the length is 1.1 miles.