The fourth round of pre-season testing kicked off at the Circuit de Catalunya in Barcelona on Tuesday morning
Ferrari, Mercedes, Williams and Hispania have all opted to start their testing program on Wednesday, meaning that the focus on day one will be primarily on Red Bull and McLaren.
The first session of testing will run from 08:00 GMT to 12:00 GMT while the afternoon running will take place between 13:00 GMT and 16:00 GMT.
Tuesday's line-up:
Red Bull: Mark Webber
McLaren: Jenson Button
Renault: Nick Heidfeld
Force India: Nico Hülkenberg (morning) and Paul di Resta (afternoon)
Toro Rosso:Sébastien Buemi
Team Lotus: Davide Valsecchi & Luiz Razia (morning), Jarno Trulli (afternoon)
Virgin: Jérôme d'Ambrosio
Source: Planet-F1