在美国开小绵羊要不要驾照

各个州的法律不一样，主要是看你车子的最高速度。我这里是45mph以上就要驾照了。
摩托车的驾照就是在你的汽车驾照上加个tag而已，一般要笔试和路考的。

在密西根州，如果是30 英里时速以下的及49cc（含）以下的就不用。

In Michigan, the law defines a motorcycle as a two- or three-wheeled vehicle with a saddle or seat that can attain speeds greater than 30mph and that has a gasoline engine bigger than 50cc.

在加州，20英里时速以上，你可能需要M2的摩托车驾照。

The California Motorcycle Driver Handbook describes two different types of motorized bicycles, or mopeds.

The first type is a two- or three-wheeled vehicle, not capable of more than 30 mph on level ground with:

Fully functional pedals for human propulsion.An internal combustion engine producing less than two gross brake horsepower with automatic transmission.An electric motor with or without pedals.

The second type of moped has an electric motor of less than 1,000 watts and cannot go above 20 mph on level ground (even if assisted by human power). The motor must also stop when the brak