Rules & penalties · Updated for 2026
Yellow flags in Formula 1 explained
What single and double waved yellow flags require drivers to do around a hazard.
Quick answer
A yellow flag warns of danger. Drivers must slow, cannot overtake and must be ready to change direction; under double yellows they must slow significantly and be prepared to stop.
Single versus double
A single waved yellow normally covers a hazard beside or partly on the track. Double waved yellows indicate a more serious obstruction or people working on or beside the racing surface.
What slowing means
Simply lifting for an instant may not satisfy the requirement. Timing and telemetry allow officials to assess whether the driver reduced speed appropriately through the affected marshalling sector.
When racing resumes
The restriction ends after the relevant green signal or as directed by race control. Drivers must not anticipate that point and complete a pass while still inside the yellow zone.