Hm, it's only something like 10% of German traffic fatalities that occur on the autobahn. And according to wikipedia, Germany doesn't rank high in terms of traffic fatalities, even by European standards. France has a similar number of highway deaths. I'm personally not a fan of the autobahn and especially not the unrestricted speed. It seems obvious that it should cause lots of fatalities, but the evidence for it just doesn't seem to be there.