Motorsports Flag Rules...

 Green flag means course clear. It is waved as a set with a yellow flag. It is waved at the next observation post at the scene that caused the yellow flag. 

 Yellow flag is waved at the post just before the scene when there is a danger on the course. At the same time, the green flag is waved at the next observation post, and the zone from the yellow flag to the green flag becomes the yellow flag zone and overtaking is prohibited. 

 Red flag means the session was suspended. Red flag is waved at all observation posts when sudden changes in weather, such as heavy rain, or when a serious accident occurs when Race Control determines that continuing to drive is dangerous or difficult. The session will be suspended. 

 Blue flag is waved when a faster vehicle is approaching from behind. In the race it is waved for the driver to be lap down. 

 Black and white flag is displayed with the car number board at the observation post near the start/finish line for driver who have acted against the sportsman spirit. 

 Black flag with an orange disc  is displayed with the number board for vehicle with mechanical defects such as damaged parts or leaking oil. These are called orange ball flag and orange disc flag. It is basically displayed at the observation post near the start/finish line. 

 Oil flag informs the driver that there is oil on the track and the course is slippery. It is also displayed when the track becomes slippery due to rain, or when there is gravel or falling object on the track. The display is done static. 

 Black flag means disqualification. It is displayed at the observation post near the start/finish line. 

 Chequered flag means the end of the session. It is only waved at the observation post near the start/finish line.