German highways are special when it comes to this. Many of them have no speed limit at all. If traffic permits, you can travel at 180 mph and it's perfectly legal. You will see many Porsches doing so, you will see the electronically limited BMS do 155mph and you will see that things like vans travel at 100-110 mph as if it's a normal thing. This 60kph speed limit would simply look out of place on an Autobahn as they call it, and I gather this stem is only to be used on the motorway, specifically designated.

Sounds incredible until you witness it yourself.