The Clerk of the Course or Race Director may impose a speed limit on the full course or any section of the track when double yellow flags are displayed during practice, qualifying practice or races. Yellow flags should not be shown in the pit lane unless there is an incident of which the driver should be made aware. Overtaking is not permitted between the first yellow flag and the green flag displayed after the incident. In some cases, however, the Clerk of the Course may order them to be shown at more than one marshal post preceding an incident. Yellow flags should normally be shown only at the marshal post immediately preceding the hazard. During free practice and qualifying, it must be evident that a driver has not attempted to set a meaningful lap time this means the driver should abandon the lap (this does not mean he has to pit as the track could well be clear the following lap).

There is a hazard wholly or partly blocking the track and/or marshals working on or beside the track. – Double waved: Reduce your speed significantly, do not overtake, and be prepared to change direction or stop.

It must be evident that a driver has reduced speed this means a driver is expected to have braked earlier and/or noticeably reduced speed in that sector. There is a hazard beside or partly on the track. – Single waved: Reduce your speed, do not overtake, and be prepared to change direction. This is a signal of danger and should be shown to drivers in two ways with the following meanings:

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