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Flags

Chequered flag.
Formula One World Championship, Rd 4, Spanish Grand Prix, Practice Day, Barcelona, Spain, Friday, 25 April 2008 Flags - a marshal waves a blue flag Formula One World Championship, Rd 2, Malaysian Grand Prix, Race, Sepang, Malaysia, Sunday 8 April 2007. World © Sutton Red Flag.
Formula One World Championship, Rd6, Monaco Grand Prix, Practice Day, Monte-Carlo, Monaco, Thursday, 24 May 2012 Marshal waves green flag.
Formula One World Championship, Rd16, Korean Grand Prix, Qualifying, Korea International Circuit, Yeongam, South Korea, Saturday, 13 October 2012 Nico Rosberg (GER) Mercedes AMG F1 W03 passes a yellow flag.
Formula One World Championship, Rd9, British Grand Prix, Race, Silverstone, England, Friday, 6 July 2012 Signal lights.
Formula One World Championship, Rd16, Korean Grand Prix, Preparations, Korea International Circuit, Yeongam, South Korea, Thursday, 11 October 2012

Marshals at various points around the circuit are issued with a number of standard flags, all used to communicate vital messages to the drivers as they race around the track. A special display in each driver’s cockpit - known as a GPS marshalling system - also lights up with the relevant flag colour, as the driver passes the affected section of track. Travelling at such high speeds, it may be hard for a driver to spot a marshal’s flag and this system helps them identify messages from race control more effectively.

Chequered flag
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.

Yellow flag
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.

Green flag
All clear. The driver has passed the potential danger point and prohibitions imposed by yellow flags have been lifted.

Red flag
The session has been stopped, usually due to an accident or poor track conditions.

Blue flag
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.

Yellow and red striped flag
Warns drivers of a slippery track surface, usually due to oil or water.

Black with orange circle flag
Accompanied by a car number, it warns a driver that he has a mechanical problem and must return to his pit.

Half black, half 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.

Black flag
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.

White flag
Warns of a slow moving vehicle on track.