In Germany, a bus can go up to 100 km/h (62 mph), cargo trucks including tractor units 90 km/h (56 mph) - this would include the "N2" vehicle class. However, t

In Germany, a bus can go up to 100 km/h (62 mph), cargo trucks including tractor units 90 km/h (56 mph) - this would include the "N2" vehicle class. However, there seems to be a "M1" class for passenger vehicles that isn't weight restricted. My understanding is that the truck cannot be classified as a commercial vehicle (too heavy) so they classify it as a N2 truck to save tax, but they could presumably also classify it as M1 (paying the tax but avoiding the need for the speed limiter). I read it as "commercial vehicle" being a third class that would normally be used as a way to bypass the tax if the vehicle wasn't too heavy for that.