When a driver receives a notification of a blue flag, it means that they are being approached by a car that has completed a greater number of laps. The blue flag will be shown when the lead car is within 1 second of the lapped car. The lapped car must do the following:
- Not attempt to race the lead car by attempting to defend their position.
- Move out of the way and concede track position within a reasonable timeframe (within four corners is considered reasonable) after the initial blue flag or when safe to do so.
- Concede track position in a safe manner to avoid impeding the lead car.
- Do not make drastic change of direction, change of speed or brake suddenly while in front of the lead car.
- Move out of the way on a straight or well before the braking zone.
If a lapped car has the speed to pull away from and not impede the lead car, then the lapped car has one lap to pull out of blue flag range.