Formula One World Championship: Sebastian Vettel (GER) Ferrari and Esteban Gutierrez (MEX) Ferrari Test and Reserve Driver walk the track at Formula One World Championship, Rd4, Bahrain Grand Prix Preparations, Bahrain International Circuit, Sakhir, Bahrain, Thursday 16 April 2015.
Sebastian Vettel (GER) Ferrari and Esteban Gutierrez (MEX) Ferrari Test and Reserve Driver walk the track at Formula One World Championship, Rd4, Bahrain Grand Prix Preparations, Bahrain International Circuit, Sakhir, Bahrain, Thursday 16 April 2015.