The first day of pre-season testing for the new Formula 1 season has started at Spain's Jerez track with three leading teams unveiling their cars. World champions Mercedes, runners-up Red Bull and third-placed Williams showed off their new designs in the pit lane before beginning preparation work. Eight teams are in Jerez discovering whether the months of design work on revising their machines has paid off. Force India have missed the test because their 2015 car is late. The big secret was the Red Bull, as Mercedes and Williams had already released pictures or images of their challengers. Most of the changes to the Red Bull car are 'under the skin', chief engineer Rob Marshall says It was...
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