Black and White Diagonal Flag

The Black and White Diagonal Flag is a warning signal shown to drivers for unsportsmanlike behavior during a motorsport race, functioning similar to a "yellow card" in soccer.

This flag is displayed alongside the driver's car number and serves as a final warning before more severe penalties are applied. It typically indicates behaviors like intentionally forcing another car off track, moving under braking, or repeatedly exceeding track limits.

If a driver continues the unsportsmanlike conduct after receiving this warning, race officials may escalate the situation to time penalties or other sanctions. Not all racing series use this flag, and its implementation can vary between different motorsport categories.