You have to drive at least 60 km/h on the motorway

It is wrong to say that you have to drive at least 60 km/h on the Autobahn. The StVO only states that only vehicles that are allowed to drive faster than 60 km/h due to their design are allowed to use the Autobahn. You decide how fast you want to drive based on the respective (weather) conditions. Of course, you shouldn’t willfully impede other vehicles by driving slowly.

This error could also be interesting: “On the Autobahn I can drive as fast as I want.”