A green flag is also shown at the start of the first session of the day.
Blue A blue flag indicates that the driver in front who is one or more laps down must let faster cars behind pass. If the driver ignores 3 consecutive blue flags, a penalty is issued to the driver. In practice and qualifying, this is shown when a car is being hindered by a slower car.
White Slow moving vehicle ahead - often waved on the last corner during free practice when drivers do practice starts. Also used when a miscellanious vehicle, such as the medical car or an ambulance, is on track.
Red Session suspended or stopped due to imminent danger to competitors or spectators, or due to bad weather. All cars proceed to pits.