[Linderpat]

I have. It is spectacular, but very narrow. When I was at Glacier, I went over the mountain on the RTTS several times. It isn't a fast drive, and there is typically lots of traffic. Just enjoy the views. Another great road is the Beartooth highway just outside of Red Lodge, Montana, and the east entrance of Yellowstone at Cook City. The most spectacular road I've ever been on. You can go faster there too. Traffic is well spread out typically. In Idaho, go down through Driggs and into Jackson Hole WY, then up thru Yellowstone, across the Lamar Valley, out thru Cooke City over the Beartooth.