Result of good lobbying? German government wants to privatize the autobahn

This is really nonsense from the economic perspective: The German government can finance its infrastructure (among others) basically at zero costs due to low interest rates. Nevertheless, it wants to privatize the Autobahn (to be correct, major parts of it) in Germany. It seems that good lobbying is here at work. Private investors do not earn currently any interest rates on their capital. So some smart guys think they can get the German Autobahn, raise the price for its use and get so a good return on their capital.