I got mine street legal here in Arizona along with my Raptor.  It's easy as hell here.  I ride mine all over even on the highway to get to the river.  Here in AZ you need a mirror, horn, and the Polaris license bracket that has a light shining on the plate.  Oh yea plus insurance and registration like a real vehicle.

The Polaris dealer I got mine at hooked it up with the Motor Vehicle Division for me.  I paid like 200 bucks and they registered it and sent me the plates in the mail, never had to go to the MVD.  Then I called my insurance and added it.  Booya.