There is multiple signs at each end.
I was up there on the motorcycle today for a big loop ride. As I was just leaving the viewpoint area at the top, a large Montana 5-er (at least 36ft) was headed west. I was wondering how they get through and how long it took to get past all the sharp hairpins.
West side

East side

Dee Wright Observatory

If you do this road. Stop and see the great work the CCC did when building this observatory. There are small windows to view the mountains far away and larger windows to view the closer mountains.