F1 flags and penalties explained: yellow, blue and red flags, track limits, grid drops

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Penalties in Formula 1 can feel confusing when you are new. A driver finishes third, then drops to sixth after the race. Another starts from the back despite qualifying well. Most of it follows clear rules, and once you know the flags and the main penalty types, the decisions make sense.

The flags drivers see

Marshals wave flags around the circuit, and drivers also see the same signals on lights and on their steering wheel display.

Green means the track is clear and racing can resume.
Yellow warns of danger ahead. Drivers must slow down and may not overtake. A double waved yellow means slow down significantly and be ready to stop.
Yellow and red stripes warn of a slippery surface, such as oil or water.
Blue tells a driver being lapped to let the faster car through. Ignoring repeated blue flags brings a penalty. In practice and qualifying it simply warns that a faster car is approaching.
Red stops the session. Cars return slowly to the pit lane.
White warns of a slow vehicle ahead, such as a recovery truck.
Black and white diagonal is a warning for unsporting behaviour, often shown after repeated track limits breaches.
Black with an orange circle tells a driver their car has a mechanical problem and they must pit.
Black means disqualification.
Chequered marks the end of the session.

Safety car and virtual safety car

When an incident needs more than a local yellow, race control can deploy a safety car or a virtual safety car. Both slow the whole field, and overtaking is not allowed until racing resumes.

Track limits

The white lines at the edge of the track define its boundary. A driver who leaves the track with all four wheels and gains an advantage can be punished.

In qualifying and practice, the lap time is usually deleted.
In the race, offences are counted. After a few, the driver is shown the black and white flag. Further offences lead to a time penalty.
Leaving the track and gaining a lasting advantage, for example by passing someone off track, usually means giving the place back or being penalised.

Who decides

A panel of stewards, including a former driver, reviews incidents using video, telemetry and team radio. Drivers and team representatives may be called in to explain themselves. Decisions can come during the race or after it.

The main penalty types

Five-second and ten-second time penalties. The driver either serves it at their next pit stop, with mechanics waiting before working on the car, or has it added to their race time.
Drive-through penalty. The driver must go through the pit lane at the speed limit without stopping.
Stop-and-go penalty. The driver must stop in the pit box for a set time, with no work allowed on the car.
Grid penalties. The driver starts further back at the next race. These are common for causing collisions or for using more power unit parts than the season allowance.
Reprimands. A formal warning. Too many in a season can turn into a grid penalty.
Disqualification. Usually for a technical breach, such as a car found underweight or with an illegal part after the race.

Penalty points

Each driver has a superlicence. Many offences add penalty points to it. A driver who collects 12 points within 12 months is banned from the next event. Points expire a year after they were given, which is why commentators often mention a driver being close to the limit.

Why results change after the race

Cars go through technical checks after the flag, and stewards may still be reviewing incidents. A post-race time penalty can push a driver down the order, and a technical breach can remove them from the results. That is why the official classification is the one that counts. Seen a penalty you did not understand? Ask about it in the comments.