Coverage depends on ground receiver reception and is not a complete picture of traffic.
The hex code is the aircraft's ICAO 24-bit address, broadcast by its ADS-B transponder. It is the key used to match live position reports to this registration.
The pilot's improper us of flight controls during an attempted takeoff, which resulted in an collision with the specially equipped automobile.
The failure of the airshow aerial performer to maintain a grip on the airplane's externally mounted rope ladder for unknown reasons and his failure to install and use a safety line resulting in his fall to earth. A factor in the accident was the sudden 'blossoming' by the air stream of the performer's jacket just before he lost his grip due to inadequate preflight securing.
THE PILOT'S FAILURE TO MAINTAIN ADEQUATE CLEARANCE FROM A MOVING AIRCRAFT.