Flags - A Primer

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The Green Flag:  Indicates the beginning of a session or the end of the danger in a particular part of the track. 

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The Yellow Flag:  Danger ahead, caution necessary and overtaking is prohibited.  A waiving yellow flag means slow down and prepare to stop if instructed to do so. 

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The Black Flag:  Generally accompanied by a car number, summons the driver of a the car flagged to the pits immediately. 

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The Blue Flag:  During a session, notifies a driver he is about to be passed and to let the other car overtake.

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The Debris/Oil Flag:  Warns drivers the track may be slippery with fluids or debris is on the track surface. 

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The Meatball Flag:  Usually accompanied by a car number warning the driver his car has a mechanical problem and he must go to the pits. 

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The Safety Flag:  Informs drivers an emergency or service vehicle is on track and to give the emergency vehicle the right of way.  

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The Red Flag:  Shown around the entire track to indicate the session has been stopped in the interest of safety.  Come to a controlled stop at the nearest corner worker station.

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The White Flag:  Last lap of the session.

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The Checkered Flag:  Always signals the finish of a session.