Not that twisty B-500, Black Forest
The [mildly] twisty road of the B-500 - the Schwarzwaldhochstrasse (The Black Forest high street). Reasonably scenic and only mildly twisty. Some of the roads in the far south of the Black Forest region (outside the National Park) are better in terms of twisties. Heck, if you really want good twisties, just drive back south into the Alps!