A yellow and red vertically striped flagRace tracks have long used flags as a way for marshals to communicate with drivers. The colour and meaning of... There's more... is used to warn F1F1 is the pinnacle of open wheel, single seater car racing and arguably the highest level of any motorsport globally.... There's more... drivers that the track is slippery.
Typically if there is water or oil has been spilled.
This flag will also be waved from side to side when there is a small animal on track.