Button: Chicane will have to be improved

It was every driver's worst nightmare. During qualifying, Sergio Perez lost control of his racing car whilst exiting the tunnel, and the side of his Sauber hit the front part of the barrier on the exit from the chicane with some considerable force.

In 2003, McLaren's Jenson Button had a similar accident at the same chicane, which is why he is insistent that safety needs improving at this point.