"Explain how the autobahn is one of the safest roads in the world despite no speed limit at all?"
This is kind of a tricky question. I know it wasn`t directed at me, but I can`t help myself here.
The Autobahn is very well maintained , that in itself makes it a safer road to travel. It is much different than the highways in the U.S.. Most to all Germans who travel it kind of know the rules and follow them fairly well. When you have cars traveling at very high rates of speed coming up behind you, you tend to pay attention. The Autobahn is also well policed and there are stiff penalties for doing the wrong thing.
Unlike our highways, which are crap , and people act like idiots because they do not respect other drivers.
So comparing our highways to the Autobahn is really not a good comparison, IMO.
some good points
I drove quite a bit in Germany and never saw a pothole anywhere. The Autobahn is very thick concrete. There is nothing like a Porsche 911 passing you like you were standing still, while you are doing 175kph.
The driving qualification tests for most of Western Europe are significantly more difficult that is required for U.S. drivers. That is one of the reasons not often cited why the Western European accident rates are lower than in the U.S.
Also, the penalties for causing an accident are more severe than in the U.S.