Kicking off raykem.tripod.com's new Formula One™ Racing For Dummies - which tells you everything you need to know to follow and understand all the Grands Prix - is a look at the meaning of flags.
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.
Below is a guide as to what they all mean:
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.
Blue flag
Warns a
driver that he is about to be lapped and to let the faster car overtake, should
he disobey penalties can be awarded. A blue light will also appear in the
cockpit. 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 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
flag
Accompanied by a car number, it warns of unsporting behaviour.
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