German speed limits.

[nick crisp]

The B500 (in my opinion well overrated) was teaming with police the last time I passed through. Both the Mosel and Rhein valley we didn't see any police and IMO much better roads.

I thought it wasn't bad, but plenty of other nice ones in the region too. I did it partly because so many people rave about it, but agree, it's perhaps overrated. Not a bad route down to Switzerland though, although the Route des Cretes through the Vosges is at least it's equal, though less direct if that's your destination.
But when I did it, teeming with police it wasn't. Luck of the draw then, I suppose.