Maybe I expressed myself poorly. Generally, higher speed is associated with higher fatality rates, all else being equal. So, one would assume a highway without speed limits would cause lots of fatalities. Most people would probably be surprised to learn that this is not the case.
If there is anything remotely potentially dangerous, unlimited speed ends and the road gets well defined and enforced speed limit. If the traffic on that segment of the road gets high, they put in speed limit sign too.
Moreover, there is a question of liability for the insurance purpose. If you go above 130, you are assumed to be caused of the accident. So, most Germans go roughly 130 in those segments anyway.
