Race Week & The Epic HDRA Reno 500 Off Road Race consists of a week long series of events focused around off-road racing. The HDRA (High Desert Racing Assoc) Reno 500 Off-Road Race is the ONLY large motorsports event in the country that offers spectators the ability to participate in pre-run activities on the actual race course. Spectators can become members of HDRA and take their trucks, Jeeps, Hummers, Razors, or any off-road type of vehicle on the race-course and enjoy the fun with their families.