Nevada has authorised self driving cars (such as Google ones) ! This authorisation is at the moment a provisional authorisation to test the system. The cars are totally computer drived cars. An operator is always in position to take control of the vehicle at the moment. This operator has to pass through an examination to be able to avoid as far as possible any incident. The car has also cameras to register each move and will allow support to analyse any incident who could occur during the test phase. A special licence place is displayed on the car using a red color with the infinite symbol.
More informations on Los Angeles Times