ABSOLUTELY NO PASSING is permitted, until completely past the incident, or until past next manned flag station that is not displaying any Yellow Flag(s), whichever comes first. If you pass a manned corner station displaying no flag, you can assume green conditions. Note: You will not always get a green flag, often you will simply be entering a green track. In HPDE you will not see this very often, this flag is usually displayed if the morning session begins with a double-yellow lap, the starter will wave the green flag to signify the ending of the yellow opening lap. 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. Knowing and understanding these flags must be second nature to you. 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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