What parc ferme means
Parc ferme is French for "closed park." In Formula 1, it refers to the rule that once a car has completed qualifying, it must remain in a locked, supervised area until race day. During this period, teams are severely restricted in what they can change on the car.
The rule was introduced to prevent teams from running one setup for qualifying (optimized for a single fast lap) and a completely different setup for the race (optimized for endurance). Parc ferme forces teams to find a compromise that works for both.
What teams can and cannot change
Once a car enters parc ferme after qualifying, teams can only make a limited set of changes:
- Allowed: Tire changes, fuel loading, minor bodywork adjustments, brake duct changes, and software updates that do not affect the car's fundamental setup.
- Not allowed: Suspension geometry changes, wing angle adjustments, ride height modifications, ballast redistribution, or any change that alters the car's aerodynamic or mechanical balance.
If a team needs to make a prohibited change, the driver must start from the pit lane — a significant penalty that effectively eliminates any chance of a good result.
How parc ferme affects setup strategy
Parc ferme forces teams to think about qualifying and the race as a single challenge. A setup that is perfect for qualifying but terrible for the race is useless. A setup that is perfect for the race but too slow in qualifying means starting from the back.
This is why teams spend so much time in practice finding the sweet spot — a setup that is fast enough to qualify well but balanced enough to manage tire degradation and fuel consumption over a full race distance.
Parc ferme exceptions
There are limited exceptions to parc ferme rules. If weather conditions change dramatically between qualifying and the race — for example, if qualifying is dry but the race is wet — teams are allowed to make additional changes to adapt the car to the new conditions.
In the 2026 era, with Active Aero adding another layer of complexity, parc ferme rules have been updated to ensure that teams cannot change the fundamental aero configuration of the car after qualifying. The Active Aero settings themselves are free to be adjusted during the race, but the physical wing angles and floor settings are locked.