What does a blue flag mean in F1? — F1 term explained

A blue flag is waved at a slower car that is about to be lapped by a faster one, instructing the slower driver to let the leader past at the earliest safe opportunity. It keeps the cars fighting for position from being held up by those a lap or more down. A driver who ignores repeated blue flags can be penalised. Blue flags are only about lapping — they are not shown between cars racing on the same lap.

Related race procedure & flags terms

Formation lap — The single lap the field completes behind no one to reach the grid, warming tyres and brakes before the start.
Parc fermé — The "closed park" rules that lock a car's set-up from the start of qualifying, banning most changes before the race.
Safety Car — A road car sent onto the track to lead and slow the field when there is a hazard, bunching the pack.
Virtual Safety Car (VSC) — An electronic slow-down that holds every car to a set delta time without deploying the physical Safety Car.
Yellow flag — Warns of a hazard ahead: slow down, no overtaking. Double waved yellows mean a serious hazard and be ready to stop.
Red flag — Stops the session immediately; cars return to the pits or grid because conditions are unsafe to continue.
Black flag — Shown with a driver's number, it orders that driver to return to the pits — they are disqualified or excluded.
Black-and-white flag — A sporting-conduct warning shown with a driver's number — effectively a yellow card for unsporting driving.
Chequered flag — The black-and-white checked flag waved at the finish line to signal the end of the session or race.

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Definition written in plain language from the current F1 sporting rules and common usage, current as of 14 August 2026. Unofficial; not affiliated with Formula 1.