Tunnels Ahead

There's a sign on Highway 12 on the way to Bryce Canyon that alerts drivers to "tunnels" ahead. When I think of tunnels, I think of the ones on the Pasadena Freeway in Los Angeles. Or, more recently, the ones through Provo Canyon. But on Highway 12?

When is a tunnel not a tunnel?

I suppose this is a tunnel, though, rather than an arch. But that's another National Park.

Nature's amazing, isn't it? Perfectly cut as if by a pneumatic tool so as to allow vehicular traffic.

Welcome to Tunnels National Park.