[Prodigal Son]

On the basis of very limited observation, I've tentatively concluded people tend to exceed the speed limit-no matter how high you set it.

I don't know about that. The Autobahn in Germany still has many stretches with no speed limit at all. Most people seem to like to drive at around 130 km/h (approx- 78 mph). There's always the BMWs that are driving in excess of 100 mph but for the most part it seems that around 130 km/h is a speed that most people like to drive- myself included.

[RightWhale]

Driving my MicroBus on the Autobahn, I rarely passed anyone. Sometimes, though.