The first Formula One track action of the year has been taking place in Barcelona this week.

World champion Lewis Hamilton and his rivals have been completing hundreds of miles of testing at the Circuit de Catalunya ahead of the forthcoming campaign which gets under way in Melbourne next month.

Here, Press Association Sport looks at some of the best pictures of the 2019 cars being put through their paces.

Lewis Hamilton hits the track on day four of the opening testLewis Hamilton hits the track on day four of the opening test (David Davies/PA)
Sebastian Vettel's Ferrari team have impressed in Barcelona Sebastian Vettel’s Ferrari team have impressed in Barcelona (David Davies/PA)
Dutch driver Max Verstappen will lead Red Bull's charge in 2019Dutch driver Max Verstappen will lead Red Bull’s charge in 2019 (David Davies/PA)
Daniel Ricciardo will drive for Renault this season after leaving Red BullDaniel Ricciardo will drive for Renault this season after leaving Red Bull (David Davies/PA)
Frenchman Romain Grosjean puts the new Haas through its pacesFrenchman Romain Grosjean puts the new Haas car through its paces (David Davies/PA)
British teenager Lando Norris will make his debut in Melbourne next monthBritish teenager Lando Norris will make his debut in Melbourne next month (David Davies/PA)
Sergio Perez will compete for the re-named Racing Point team this seasonSergio Perez will compete for the re-named Racing Point team this season (David Davies/PA)
Kimi Raikkonen has joined Alfa Romeo after he was replaced at Ferrari Kimi Raikkonen has joined Alfa Romeo after leaving Ferrari (David Davies/PA)
Alexander Albon tests for Toro Rosso ahead of his rookie F1 campaignAlexander Albon tests for Toro Rosso ahead of his rookie F1 campaign (David Davies/PA)
George Russell on track for Williams after the British team missed the first two-and-a-half days because their car was not readyNovice George Russell on track for Williams after the British team missed the first two-and-a-half days of testing because their car was not ready (David Davies/PA)