Its yellow flag either it would be waved with 1 or doubled. If it's one yellow flag, it indicates danger ahead, such as debris from a crash. Drivers must slow down as they pass; no overtaking is permitted, unless it is unavoidable such as a driver retiring in the section, or a driver is lapped. Double waved yellows at the same post indicates great danger ahead. Drivers must slow down and be prepared to stop; no overtaking is permitted unless a driver is lapped.
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