Part of our UK Motorsport series. Start with the pillar guide: How to Get Into Motorsport in the UK.
Flags are how a race talks to its drivers. They are bright, loud and absolutely vital.
A driver at 120 mph cannot read a radio message at the last second. Marshals wave flags at posts around the circuit instead. Learn them and the race makes far more sense.
Always check the rules of the series you are watching or entering. Meaning can vary slightly. These are the common ones.
Green flag
The track is clear. Go. A green flag also signals the end of a caution zone.
Yellow flag
Danger ahead. Slow down. Overtaking is not allowed in the zone.
A single waved yellow means be ready to change direction. Something is on or beside the track.
Double yellow
Serious danger. Slow right down. Be ready to stop.
A marshal or vehicle may be on the circuit. Respect it.
Yellow with red stripes
The surface is slippery. This often means oil, water or debris. Grip is reduced.
Red flag
Stop. The session is suspended. Drivers return to the pits or stop on the grid, as directed.
A red flag usually follows a serious incident or a track that cannot be driven safely. Do not race on.
Blue flag
A faster car is about to lap you. Let it by.
In many series, drivers must give way within a set number of corners. Ignore it and you risk a penalty.
White flag
A slow vehicle is on the track. It might be a safety car, an ambulance or a damaged car. In some events the white flag also signals the last lap. Check the regulations.
Black flag
The driver must come into the pits. It often means a penalty or disqualification. The driver’s number is shown with it.
A black flag with an orange disc means a mechanical problem. Your car may be dangerous. Stop and have it checked.
Chequered flag
The finish. The race or session is over. Complete the cooldown lap carefully.
It is the best flag to see.
Why flags matter to spectators
Watching a race, you will see flags waved by marshals at each post. They keep drivers safe and the race fair. Spot a yellow and you know why the pace has slowed. Spot a blue and you know a leader is lapping a backmarker.
It adds real depth to a day at the circuit. For a wider view, read race weekend explained and the best car racing circuits in the UK.
Why flags matter to drivers
Flag discipline is a safety skill. New drivers learn it in their ARDS test. Our guide to how to get into motorsport in the UK explains the whole route.
Racing is a team sport, even when you sit alone in the cockpit. The marshals are part of the team.
Want to know how top series organise all this? See GT3 vs GT4 explained.
