Not sure, but I don't think they are street legal in the United States. I've been in one in Europe. Would not want to be in an accident in one.
Here in Milwaukee we have a Smart dealer right nextdoor to a Hummer dealer talk about a contrast. http://www.bergstromauto.com/MiscPage
I wanna drive up there and buy one. can I ? Is there a law that prevents me from buying and bring it back to the US? is anyone a dealer? can anyone help? Yes Im keeping the NSX
dont forget: when you get a flat tire, you have to call mercedes...and they will literally pick up the car from you, fix the tire, and return it. There is no spare tire. My cousin has a smart car and learned this the hard way