Practice is part of the race weekend. Testing is restricted running outside it.

Practice is controlled, but it is not parc ferme

Before parc ferme begins, teams can normally change setup, compare specifications, collect data, and adjust the car within the technical, tyre, component, and event rules. That is why practice programmes often look different between teams: one car may run heavy fuel, another may try a qualifying simulation, and another may test a new floor or wing.

1. Setup work: teams use practice to choose mechanical balance, ride height, aero level, cooling, and tyre preparation before the competitive sessions matter.
2. Reliability checks: practice exposes brake, power-unit, cooling, sensor, and software issues before qualifying or the race.
3. Tyre learning: long runs and short runs help teams understand degradation, warm-up, graining, and compound choice.
4. Driver preparation: drivers learn track evolution, traffic, braking points, energy deployment, race-start procedures, and pit-entry details.

Free practice is not a free-for-all

Practice is still part of the competition. The Race Director controls the session, flags and safety rules apply, tyres are allocated and returned under the tyre rules, component limits still matter, and breaches can be referred to the stewards.

• Only the session is "free": teams may choose when to run, but they must obey pit-lane, track-limits, flag, safety, and scrutineering requirements.
• Practice laps can still have consequences: crashes, unsafe releases, impeding, yellow-flag offences, or component changes can affect the rest of the weekend.
• Tyre rules matter: practice running is shaped by the tyre allocation and return schedule, so teams cannot simply use unlimited sets.
• Parc ferme changes the picture: once parc ferme applies, the team cannot treat later running as a setup reset.

What current-car testing can include

The exact calendar and allowances can change by championship year, especially around major regulation changes. Under the current 2026 sporting regulations, current-car testing is limited to defined opportunities rather than open private running.

1. Pre-season collective testing: organised tests are open to all competitors and controlled by FIA timing, car-count, and running-day rules.
2. Post-season testing: the end-of-year test can combine tyre work for licensed drivers with a young-driver opportunity, using car and component specifications allowed by the regulations.
3. Out-of-competition tyre testing: tyre-supplier tests exist to develop tyres, not to give one team a private car-development shortcut.
4. Substitute-driver testing: a limited test can be available when a team brings in a driver who has not recently raced in F1, with timing and circuit restrictions.

Older cars are controlled because they still teach teams things

Previous-car testing is useful for driver preparation, sponsor activity, and operational practice, but it can still produce relevant information. That is why the rules limit the cars, parts, circuits, drivers, tyres, days, and mileage involved.

• TPC days are capped: the 2026 rules limit each competitor to a maximum of twenty days of previous-car testing in a calendar year.
• Race-driver mileage is capped: running by current or intended championship drivers is limited to 1000 kilometres across a maximum of four TPC days.
• Circuits are restricted: previous-car testing must use FIA Grade 1 or Grade 1T circuits and is restricted around circuits hosting that year's championship events.
• Mule cars serve a defined purpose: mule-car testing is used for future tyre or FIA system work, not general car development.

Rookie practice is not extra team testing

F1 rules require teams to give specified free practice running to drivers with limited grand prix experience. This is often described as a rookie FP1. It gives emerging drivers useful mileage, but it does not create a third race car or an extra tyre allocation for the team.

1. Each car is covered: under the current rules, each competitor must use an eligible limited-experience driver during two competitions for each entered car.
2. The team must notify the FIA: the driver and the car they will use must be declared before the relevant competition.
3. The car's normal allocation is used: the rookie uses the power unit and tyres allocated to the nominated driver.
4. Session limits still apply: no more than two drivers may be used in any one session.

Tyre testing has safeguards against hidden development

Tyre testing can involve current, previous, or mule cars depending on the approved programme, but the purpose is tyre development. The regulations restrict parts, software, sensors, component changes, and data use so that a tyre test does not become a disguised upgrade test.

• Test purpose matters: parts and software changes must be connected to evaluating tyres or completing the approved programme.
• FIA and tyre-supplier approval matters: sensors or setup changes can require advance agreement rather than unilateral team choice.
• Some data is shared: tyre-state and performance data from agreed sensors can be provided to the tyre supplier and shared in processed form.
• Test tyres are specific: promotional, demonstration, previous-car, and tyre-test running uses tyres manufactured for that purpose, not normal race-weekend freedom.

How officials police practice and testing limits

During a grand prix weekend, practice is controlled by the same event officials who control qualifying and the race. Outside a competition, the FIA requires advance declarations for many forms of running and may appoint observers.

1. Event control: the Race Director controls free practice, session timing, stoppages, flags, and restart procedure.
2. Technical oversight: the FIA Technical Delegate and scrutineers can check car compliance during the competition.
3. Advance declarations: teams must notify the FIA and other competitors before many previous-car, promotional, or demonstration events.
4. Observer access: an FIA observer may attend track running outside a competition and the team must facilitate access once notified.

How to read an F1 practice or test story

• Ask what category it is: FP1, FP2, FP3, TCC, TPC, TMC, PE, DE, and tyre testing are not interchangeable.
• Ask what car was used: a current car can teach a team far more than an old demonstration car, so the rule category matters.
• Ask who drove: race drivers, rookies, substitute drivers, and show-run drivers can face different eligibility or mileage limits.
• Ask what tyres and parts were fitted: special tyres, frozen specifications, approved sensors, and component restrictions shape what the team can learn.