Speed limit free my azz. I got 2 speeding tickets on the autobahn while I was in Germany. Only certain sections of it are speed limit free and you can come up on a limited section pretty quickly, one that just happens to have cameras.
My neighbor has traveled to Germany often for his job over the last few decades. He told me that with almost every subsequent trip when he drives on the Autobahn, the no speed limit areas become less and less.
When I left Germany in 1983 the signs suggested “Nicht schneller als 130 km/h” and that was considered revolutionary.
But the speed trap cameras were already everywhere. You got a Strafsbefel in the mail with a pic of your USAREUR tag & a bill for DM40.
I was to Germany several times in 1986 on business. There are parts of the Autobahn that do have speed limits. Urban areas (as in near downtowns) was about 100 km/h. Construction areas were about 80 km/h and those DID get enforced.
One of the construction zones was quite impressive. The pavement is about a meter thick. Rather substantial. One trip I had a bit of a treat. There was an exercise going on, where some RAF Jaguars were using part of the Autobahn as a dispersal airstrip and doing takeoffs and landings. This was about 150km from the Inner German Border.