Indicates to drivers that the session has ended. During practice and qualifying sessions it is waved at the allotted time, during the race it is shown first to the winner and then to every car that crosses the line behind him.
The race has been stopped, usually because a car is lying in a dangerous position after an accident or because conditions are too poor for racing to be safe.
Indicates danger, such as a stranded car, ahead. A single waved yellow flag warns drivers to slow down, while two waved yellow flags at the same post means that drivers must slow down and be prepared to stop if necessary. Overtaking is prohibited.
All clear. The driver has passed the potential danger point and prohibitions imposed by yellow flags have been lifted.
Warns a driver that he is about to be lapped and to let the faster car overtake. Pass three blue flags without complying and the driver risks being penalised. Blue lights are also displayed at the end of the pit lane when the pit exit is open and a car on track is approaching.
Red and yellow striped flag
Warns drivers of a slippery track surface, usually due to oil or water.
Accompanied by a car number, it directs a driver to return to his pit and is most often used to signal to the driver that he has been excluded from the race.
Warns of a slow-moving vehicle on the track, such as a tow truck or safety car.
Black flag with orange circle
Accompanied by a car number, it warns a driver that he has a mechanical problem and must return to his pit.
Black and white flag
Accompanied by a car number, it warns of unsporting behaviour. May be followed by a black flag if the driver does not heed the warning.
© Formula 1.com