The definitions of the word "Autocross" are diferent depended on where you are on the surface of this earth. In USA, autocross is one type of motorsport where you race against the clock following a designated course marked by pylons and lines. The course is usually consisted of several turns and curves in a small area such as parking lot, mostly organized by regioal groups sanctioned by SCCA (Sport Car Club of America), the official name is Solo2. For more detail go to SCCA website. This type os racing is called "Gymkhana" in Thailand and Japan.
In Asia such as Thailand, the term "Autocross" mean the type of racing where you race you car against others in a closed circuit and on DIRT!!. ???