Getting ready for a F1 race start is complicated says Red Bull Racing driver Mark Webber.

Webber: There is a lot of work for the drivers to do as well. I cannot give too much away but there are a number of procedures to go through before we get going.When the lights go out, we quickly release one clutch paddle on the steering wheel and feed in a second gradually - that's the one the driver uses to modulate the grip of the rear wheels. This year, we have seen the biggest fluctuation in starts for years, which is purely down to the new Pirelli tyres and how they perform off the line.