Sebastian Vettel has again spoken of his unease over F1's mandatory adjustable rear wings in 2011, believing they could reduce the impact of overtaking in the eyes of spectators.

At the Jerez test last week, having already experimented with the systems earlier, teams trialled the FIA-coded software that will govern when the rear wings can be triggered on track this year to aid overtaking.

"Overtaking in F1 has always been difficult," Vettel told La Gazzetta dello Sport. "Whoever manages to get past gets the same sort of admiration as a goal scorer in football.

"There is a risk that the public thinks overtaking will now be too easy. The drivers should be driving, not playing with all sorts of different buttons and systems.

"Last year there was the F-duct, now it's the rear wing and KERS. I'm not totally convinced that this is all a good thing."