At all times: A stationary blue flag is shown to a driver when exiting the pits to indicate other cars are approaching on the track at racing speed. During practice: Stationary - a faster car is behind. Give way. Waved - A faster car behind is about to overtake. Give way urgently. During Race: Stationary - A car behind is about to pass. Let it pass. Waved - Let the car behind through immediately or risk being penalised.
A blue flag warns the driver that he is about to be lapped and to let the faster car overtake him. If a driver passes three blue flags, without complying, then the driver risks being penalised. Blue lights are also displayed at the end of the pit lane, when the pit exit is open and a car on track is approaching.
a warning to straighten out your act, a red flag means the account has been disabled for a serious violation
In most racing, the blue flag usually has a yellow or orange stripe and is used to alert a race driver of a faster vehicle approaching from behind.
This flag is used by corner workers around the track to signal a driver that a faster car is either approaching (steady flag) or actually attempting a pass (waved flag). The driver being flagged has no obligation to do anything other than be alert, maintain the racing line and avoid intentionally obstructing the faster car.
Blue Flag is used in the treatment of skin diseases, apparently aiding the skin by working through the liver, the main detoxifying organ of the body. It may be used in skin eruptions such as eczema and psoriasis, constipation associated with liver problems or biliousness, chronic hepatitis and rheumatic conditions, scrophulous skin conditions, herpes, eczema, and psoriasis.
A blue flag or signal that is placed on a car or locomotive when workers are around or under it. When a car or locomotive is blue-flagged, then it must not be coupled to or moved in any manner. The only person allowed to remove a blue flag is the person who put it there in the first place.