KERS to reduce overtaking

Germany's Nick Heidfeld, one of the smallest drivers in the championship, will use KERS in Sunday's season-opening Australian Grand Prix, but his much taller Williams team mate, Poland's Robert Kubica, will not.

"I think KERS will have a big influence, but I'm not expecting more overtaking," Kubica said.

Button said he thought the introduction of KERS may even reduce the chances of cars passing each other.

"If you don't have KERS and you are behind a car that does have KERS you're not going to be able to get past."