F1 Glossary · rules
Parc Fermé
A regulatory period where teams are forbidden from making major setup changes to their cars between qualifying and the Grand Prix.
The "Closed Park" Rule
Literally translating from French as "closed park," Parc Fermé refers to both a physical secure area at the circuit and a set of strict sporting regulations. Once a car leaves the pit lane for its first run in qualifying, it enters Parc Fermé conditions. From this moment until the start of the race formation lap, teams are prohibited from making significant mechanical or aerodynamic changes to the vehicle. The cars are often kept under seal or monitored by FIA cameras and scrutineers to ensure compliance.
Why It Matters
The rule exists to prevent teams from building "qualifying specials"—cars optimized solely for one-lap speed that would be undrivable or unsafe over a full race distance. By locking in the setup before qualifying, the FIA forces engineers to find a balance between Saturday's raw pace and Sunday's tire management and fuel efficiency. This creates a strategic tension where a car that is fastest in qualifying might struggle in the race due to a setup that is too aggressive on its tires.
What Can and Cannot Be Changed
While major components like the suspension geometry, engine maps, and gearbox ratios are locked, certain maintenance tasks are permitted. Teams can change tires, bleed brakes, and adjust the angle of the front wing flaps to account for changing wind conditions. However, if a team discovers a fundamental setup error and chooses to change a major part—such as the rear wing or steering rack—the driver must start the race from the pit lane as a penalty.
Recent Examples and Pitfalls
In the 2023 United States Grand Prix, Lewis Hamilton and Charles Leclerc were both disqualified after the race because their "plank" (the skid block under the car) had worn down beyond the legal limit. Because the cars were under Parc Fermé rules, the teams could not raise the ride height after qualifying to account for the bumpy Austin track. Another common scenario involves teams choosing to break Parc Fermé intentionally. If a driver qualifies at the back of the grid, the team may decide to overhaul the setup for better race pace, accepting a pit lane start in exchange for a more competitive car on Sunday.
Common questions
- Can teams change tires under Parc Fermé?
- Yes, teams can change tires, but they must use the compounds allocated for the race. They can also replace damaged tires with the permission of the FIA technical delegate, provided the replacement is of the same specification.
- What happens if a car is damaged during qualifying?
- Teams are allowed to repair genuine damage using parts that are identical in specification to the originals. If they replace a damaged part with a different version or an upgrade, it is considered a breach of regulations and results in a pit lane start.
- How does the Sprint weekend affect Parc Fermé?
- On Sprint weekends, Parc Fermé begins much earlier—at the start of Friday's qualifying session. This leaves teams with only one hour of practice to finalize their setup for the entire weekend, significantly increasing the risk of technical errors.
- Can teams change the engine under Parc Fermé?
- Replacing a Power Unit component usually triggers a grid penalty. If the replacement is a different specification than the one used in qualifying, or if the work is done without FIA supervision, the driver must start from the pit lane.