With the announcement that the diffusers being run by the AT&T Williams, Toyota and Brawn GP teams were legal has set off a rush by other teams to copy the design. But for AT&T Williams driver Nico Rosberg it will takes the rival teams a considerable time to not only copy them but to get them to work.

In an interview at Shanghai and reported in autosport.com Nico spoke of his view that the other teams are going to find the process of modifying their cars and make them fast not as simple as they would hope.

Nico said: "It will take many races for the others to attempt to make their cars work with that kind of diffuser and it's not a given that they'll be able to make it work. It's not a fact that they will automatically be quicker - it's not that straightforward. It will take a whole lot of time and even then you can't be sure it'll work."

As for the dominance of the Brawn GP team in the opening races Nico also feels that this situation is likely to continue.

In regard to Brawn GP's continued dominance Nico added: "A very strong chance, yeah... an extremely strong chance. The thing that must be said is that the development rate of this year's cars will be massive, because of the new rules.

"We put a part on and we'll be quicker from one weekend to the next, sometimes by two or three tenths. If you consider Brawn is maybe two tenths ahead of Toyota, that can disappear oh so quickly. Look a few months down the road and things might look a bit different."

"Brawn is quickest at the moment, then Toyota, and after that I think it's quite close between Red Bull and ourselves," said Rosberg. "It's looking quite good at the moment. I think we have an opportunity to qualify towards the front of the grid and score more good points."