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Marshalls Flags

You need to know the flags, they're the only way for the marshalls to communicate with you about hazards and safety risks. Remember, driving has you're full attention and you can only see what's right in front and behind, they can see everything.

You must look for the marshalls posts on your sighting laps and reference them throughout the day. They'll help keep you safe and out of trouble.

The flags will be explained in detail during the safety briefing on the day but you shouldn't rely upon the safety briefing to learn them from scratch. 
Flags have official Motorsport definitions but for track days we can actually be more specific. Here's the essential basics:

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Blue Flag

A faster car is trying to overtake a slower car. If you're the slower car you should allow the faster car past as soon as safe to do so on the next straight. If you're the faster car you should watch for the signal from the slower car giving you consent to overtake.

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Yellow Flag

Danger ahead. Proceed with caution at a reduced speed, be prepared to change direction or stop at any time, no overtaking, single file.

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Red Flag

The session has been stopped. Proceed with caution to the pits at a dramatically reduced speed, be prepared to change direction or stop at any time, no overtaking, single file.

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Black Flag

The organiser needs to talk to you about a mechanical problem, noise limit violation or a driving standards issue. Proceed with caution to the pits at a reduced speed immediately.

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Green Flag

The hazard has been cleared, resume normal speed.

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White Flag

Slow-moving vehicle on the track, such as a tow truck or safety car. Proceed with caution, be prepared to change direction at any time.

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Chequered Flag

The session has ended. Proceed to the pits at a reduced speed.

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Red and Yellow Striped Flag

The track is slippery. Risk of crashing, look out for fluid on circuit, SLOW DOWN IMMEDIATELY
Track:Day:Guru 2017