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Racing flags are traditionally used in auto racing and similar motorsports to indicate track condition and to communicate important messages to drivers.
1. Status flag: Status flags are used to inform all drivers of the general status of the course during a session.
The solid green flag is usually displayed by the starter to indicate the start of a session. During a session, it is displayed at the end of a caution period or a temporary delay to indicate that the session is restarting.
The solid yellow flag, or caution flag, universally requires drivers to slow down due to a hazard on the track.
The yellow and red striped flag is displayed stationary at local flag stations to indicate that there is something on the track which could reduce grip or cause a car to lose control - generally oil, coolant, small pieces of debris or sand
The solid red flag is displayed when conditions are too unsafe to continue the session.
the white flag indicates the presence of an official car or a competitor moving at below normal speed in the section of track covered by the flag station.
In the event of a bad start, the yellow and red flags may be displayed together, or a unique diagonally-divided red and yellow flag can be displayed, to indicate a restart
2. Instruction flags : Instruction flags are usually used to communicate with one driver at a time.
The solid black flag is used to summon a driver to the pits. It is usually used to punish a driver or team for disobeying the rules, but may also be used when a car is suffering a dangerous mechanical failure, such as a loose hood or dragging bumper, or even calling a driver to the pits when their radio is not working. In Formula One races, the black flag means an immediate disqualification for the driver involved.
A black flag with an orange disk in its center (also known as the “meatball” flag) indicates that a car is being summoned to the pits due to mechanical problems that are interfering with the race, such as an oil, water, or fuel leak.
A diagonally-divided black-and-white flag is displayed with a car number to indicate a penalty for unsportsmanlike conduct. This flag can be displayed if a car tries to intentionally drive another car off the course, or if a driver gets out of his/her car and initiates an altercation with another driver.
Some leagues use a black flag with a white saltire. It is displayed with a car number if a driver ignores the other black flags for an extended period of time, and indicates that that car is no longer being scored.
A light blue flag, sometimes with a diagonal yellow, orange, or red stripe, informs a driver that a faster car is approaching and that the driver should move aside to allow one or more faster cars to pass.
There is no standard design for the checkered flag. Although it nearly always consists of alternating black and white squares or rectangles arranged in a checkerboard pattern, the number, size, and length-width proportions of the rectangles vary from one flag to another. Also, the checkered flag typically has a black rectangle at the corner of the flag closest to the top of the flagpole
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