May 10 (GMM) F1's most experienced driver has criticised his countryman Felipe Massa for pulling out of the Grand Prix Drivers' Association (GPDA).

Brazilian racer Massa on Friday explained that he left the safety-oriented body because "I didn't always like the way it was run".

The development means that both Ferrari drivers, as well as Lewis Hamilton and Adrian Sutil, are not officially associated with the GPDA.

"It is a personal decision," Brazilian veteran Rubens Barrichello told the Spanish newspaper Diario AS at Istanbul Park, "but it is not good for the rest of us.

"If the association wants to be a strong influence on the FIA, it is very important to have the Ferrari drivers on board.

"And if we have the 20 guys of the grid discussing these things, then every situation is possible," he added.