RED FLAG : Usually the red flag appears only at the beginning and the end of the match. When there is an accident that may be a threat to other players' safety, it will also appear signing the end of the match. (来源：英语杂志 http://www.EnglishCN.com)

WHITE FLAG : A waving flag means you may be delayed by a slow-speed one or one that has received a heavy accident. And a still one means that there is a slow-speed motor-cycle is in the way.

BLACK FLAG : The black flag appears with a white code board .It means the motor-cycle with the code on the board should have to return to the repair station before he finishes the next circle. Usually the driver receives the black flag as a punishment. He will have to stay in the repair station for ten more seconds, which is rather long for a F1 player.

BLACK FLAG AND WHITE FLAG : Warning to the player who has fouled but not very too seriously.

BLACK FLAG WITH A RED CIRCLE : It is used to warn a driver that there is something wrong with his motor. With the flag there is also a code-board, which is to identify the player.

BLUE FLAG : In the practice, a waving flag means "the motor behind is going to pass, give way." and a still one means "the motor behind you is faster than you, give way."
In formal match, a waving flag means "give way, or you will be awarded a black flag." and a still one means "give way for the behind one is lapping."

YELLOW FLAG WITH RED STRIPES : The surface of the road is very wet, be careful.

YELLOW FLAG : Still: slow down and be careful for there is an accident forward .
Waving: slow down and be ready to change your racing line.
Double waving: it has the same meaning as mentioned above, besides it also means "get ready to stop for there may be a Safe Car or a red flag in you forward line.

BLACK AND WHITE FLAG : It is also called Check flag. It means the end of the match after the driver passes it, no matter you have raced enough circles.