The high alpine road Grossglockner Strasse is the most famous of such roads. It is really beautiful, but this means also a large number of not only cars, but also motorcycles, and what is especially unpleasant, bicycles.
The northern slope has more serpentine turns and more moving units. There are many popular tourist villages from the north and everyone returns there for the night. A southern descent with fewer turns, but sometimes with a steeper incline.