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Flag definitions are generally standard across US Trackday HPDE events, but if you are running with a new club always make sure you check and understand their flag rules. There are some additional combinations for racing that wheel to wheel racers need to know as well. These general definitions ( Italicized) have been taken right from the current NASA rulebook for HPDE.
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Knowing and understanding these flags must be second nature to you.
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They are used for general communication as well as commands during an emergency. They are the sole method of communication between you and track officials. If you ever drive on track, knowing the flags is one of your largest responsibilities.
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