Ah, so that’s what mofa stands for. Interestingly, Wikimedia Commons categorizes that particular model as a moped. But maybe it would be accurate to describe it as a subclass of motorized bicycle, which in turn is a subclass of moped (but not to be confused with electric bicycle). Things always get more complicated when we start talking about engine capacities and maximum speeds. Each jurisdiction has a slightly different vehicle classification standard, making vehicle classification a fairly poor standard on which to base way classification using globally relevant primary tags.
Here in California, we have signs for neighborhood electric vehicles, a vehicle classification specific to the U.S. While I took the liberty of coining and documenting nev=*, I’m not sure I would go as far as naming a new primary tag after this vehicle classification. At most it would be a cart path, putting more focus on the general form factor or mode of transportation.