Yes, 30 mph is slow. For a major highway ... Out in the "flat lands" ...
For winding up around all of the curves through the canyons, etc. it is pretty typical. That is if you keep moving. I stopped a LOT, to soak it all in ... 🙂
Sadly, even at that, it was over way too fast. This particular portion of my trip is at the top of where I would return, if I am ever given the opportunity.