Mar.10 (GMM) F1 drivers have raised concerns during a meeting with FIA officials at the Barcelona test.

The Grand Prix Drivers' Association is now headed by Rubens Barrichello, but former president Nick Heidfeld said this week that he is concerned the drivers "don't have the most powerful lobby".

The German's comments follow concerns raised through the media about the extreme Pirelli tyre degradation, as well as the increased workload created by KERS and the adjustable rear wings.

The Spanish sports daily AS reports that also with the involvement of team personnel, there are "many doubts" about the moveable wing in particular.

"It is speculated that changes to the rules may occur," added the report.

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