In 2009, TRA received the green light to do the maiden flight. While permission to drive on the street (on the road) has bagged now issued by the Institute of Highway Safety and Traffic (National National Highway Traffic Safety Administration / NHTSA).
In the permit mentioned, Terrafugia got some special dispensation by various considerations. For example, the TRA may use this type of tire is heavier than normal weights. Then, the glass must be specially coated to safety when a collision or hit by a bird. However, the TRA uses material polycarbonate (plastic).
The existence of exceptions, according to NHTSA to insidelane because it's flying car is still within the scope of public interest and consistency maintaining traffic safety.
Terrafugia's Transition Roadable Aircraft (TRA) is owned by The United States
Although flightless, the TRA should follow the procedures as the aircraft, ie if you want to take-off must be from the airport.