Yellow Flag with Black Stripes

A Yellow Flag with Black Stripes is a caution signal in motorsport that warns drivers of a deteriorating track surface or reduced grip conditions ahead, requiring them to slow down and avoid overtaking.

This flag is displayed when there are hazards such as oil, coolant, debris, or water on the racing surface that could affect vehicle handling. When drivers see this flag, they must exercise extra caution while navigating through the affected section of the track, though they can maintain their racing line and position.

In some racing series, this flag may be referred to as the "surface flag" or "slippery surface flag." Flag meanings can vary between different motorsport organizations, with some using a yellow flag with red stripes instead to indicate similar track conditions.