What are these kph of which you write?
100kph = 62mph = max speed for commercial transport trucks on Autobahn, and what crappy cars will do, or novice drivers
170kph = 105mph = typical "medium" traffic speed on Autobahn
240kph = 150mph = typical "faster" traffic speed for quality cars/drivers on Autobahn...these guys usually form a micro-convoy, perhaps 50 meter spacing between them, anywhere from 3 to 6 cars...mixture of Passat's, BMW's and Mercedes
300kph = 186mph = passed by a Porsche 911 going roughly about that speed...freaking nutz! But...no, his car wasn't splattered all over the road 10 minutes later...German drivers are very disciplined and while they drive FAST, they don't take STUPID moves. That may seem to contradict itself, but it isn't.