A red flag is the most dramatic intervention race control can make: the race stops, the cars file into the pit lane, and everything about the afternoon changes — strategy, tyre choices, the shape of the restart. The rules governing what happens next have been rewritten several times and remain some of the most argued-over in the sport. Here is how a red flag works, from the moment it is shown to the moment the race resumes.

Why races are red-flagged

Race control stops a session when continuing would be unsafe: a heavy crash with debris across the track or barriers needing repair, rain heavy enough to cause aquaplaning or blind drivers with spray, a track surface failure, or an obstruction the safety car cannot manage. The decision is the race director’s. A crash like Charles Leclerc’s at this year’s Italian Grand Prix, with barrier damage and a car in a dangerous position, is the classic trigger.

What drivers must do

When the red flag is shown, drivers must slow immediately, not overtake, and proceed to the pit lane, where cars line up in race order. The race clock stops, but the overall three-hour limit — within which any race must finish, stoppages included — keeps running. The order at the moment of the red flag is taken from the last completed timing line, which can produce surprising results for drivers who had just been overtaken or had just made a pit stop.

What teams can change

This is the controversial part. While the cars sit in the pit lane, teams are permitted to:

  • Change tyres — and under current rules this counts towards the two-compound requirement, meaning a driver who has not yet stopped effectively gets a free pit stop.
  • Repair damage such as replacing a front wing, fixing bodywork or clearing debris from cooling ducts.
  • Make limited set-up changes such as front-wing angle and tyre pressures.

The free tyre change is why red flags can reshape a race so brutally. A driver who pitted a lap before the stoppage has paid full price for a set of tyres their rivals now receive free. Drivers and teams have argued for years that tyre changes under red flags should be restricted, but the rule remains, partly because forcing cars to restart on damaged or worn tyres has its own safety implications.

The restart: standing or rolling

Since 2021 the default restart is a standing start: cars follow the safety car on a formation lap, form up on the grid in the race order, and start from the lights as they did at the beginning of the race. Race control can instead order a rolling restart — the cars follow the safety car and resume racing when it peels off — when conditions make a standing start unsafe, most commonly heavy rain. A standing restart is a huge moment: launches and first-corner positioning can undo a whole race of hard-won position in seconds.

Lap counting and the “lap behind the safety car”

The formation lap of a restart counts as a race lap, which occasionally matters for how many racing laps remain and for pit-stop timing. In a heavily interrupted race the number of remaining laps can shrink to the point where the strategy conversation stops being about tyres and becomes purely about the restart.

If the race cannot restart

When conditions do not allow a resumption, the race is declared finished and the result is taken from the order two laps before the red flag was shown, though race control has some discretion. Points are awarded on a sliding scale according to how much of the scheduled distance was completed — provided the leader completed at least two racing laps — which we set out in our points system guide. The rule was written after the 2021 Belgian Grand Prix, when half points were awarded for a handful of laps behind the safety car.

Red flags in qualifying and practice

Qualifying red flags are more common than race stoppages and change the session’s dynamics entirely: when the session resumes, only the time remaining is available, which can leave drivers with a single lap to escape elimination. A red flag in the final minutes of Q3 can freeze the grid with some drivers never having set a representative lap. Practice red flags simply cost track time — though on a sprint weekend with a single practice session, that lost time can compromise the whole weekend.

Frequently asked questions

Can teams change tyres during a red flag?

Yes, and the change counts as using a second compound — effectively a free pit stop, which is why the rule is controversial.

How does a race restart after a red flag?

Normally with a standing start after a formation lap behind the safety car; a rolling restart can be used if conditions make a standing start unsafe.

Do drivers get points if the race is not restarted?

Yes, on a sliding scale depending on the distance completed, provided the leader completed at least two racing laps.

Is there a time limit on F1 races?

A race must finish within three hours of its start including stoppages; the race clock pauses during a red flag but the overall limit still applies.