Double Yellow flags are a step up from a single yellow flag
The Yellow flag is possibly the most important and most used flag during a race. It is used to inform... There's more... and prohibit overtaking until the obstruction is cleared. The Driver
OK, so we all know what the driver is, right. I've always liked the description that F1 drivers are like... There's more... is required to reduce speed immediately and be prepared to take avoidance measures once the yellow flag
Race tracks have long used flags as a way for marshals to communicate with drivers. The colour and meaning of... There's more... is sighted.
Racing resumes once a green flag
The green flag signals that the track is clear and drivers can race. The flag is used at the pit... There's more... is waived, usually at the marshal station immediately after the obstruction has been passed. If the double yellow flags are waved from the starters tower the entire track is under a “full course caution”.
In addition to the yellow flag, tracks often signal with a flashing yellow LED light.
