Renault driver Jarno Trulli has backed calls from Max Mosley, the president of the sport's governing body, to cut speeds in Formula One.
Felipe Massa was lucky not to be hurt in this accident, Mosley says
Crashes involving Ralf Schumacher and Felipe Massa in the last two races have highlighted F1's dangers.
Trulli said: "Formula One cars are very quick, we need more safety and we need to slow them down.
"I think the FIA has to work to slow the cars down and to give more safety to the drivers and the spectators."
Trulli's comments come after Mosley warned there could be fatalities if speeds are not reduced.
"The faster the cars go, the greater the probability that someone will be hurt or killed," said the FIA chief, who has told teams they must slow down their cars or changes will be forced on them.
Schumacher could miss the rest of the season after fracturing his spine in two places after crashing his Williams into a concrete wall at the US Grand Prix in Indianapolis on 20 June.
And Massa smashed his Sauber into tyre barriers at the Canadian Grand Prix in Montreal on 13 June.
"Ralf('s impact) was 78G. Massa was 113G," Mosley said.
"In Massa's case, if he hadn't had the latest HANS (head and neck safety) system and the other precautions... his head would have hit the steering wheel with a force 80% greater than we believe to be the borderline for injury.
"He would probably have been seriously hurt... We are at the limit. If we go on like this someone will get hurt.
"All the indications now are that we are pushing up against the barriers of what is possible and we should pull back."
Mosley said lap times had dropped by as much as nine
seconds over the past seven years.
He said that was "on the limit of what we can deal with".
A decade ago, Roland Ratzenberger and Ayrton Senna died within two days of each other after crashes at Imola.
Trulli is determined such tragedies should not happen again.
Mosley has decided to force changes on the F1 teams
He said: "No-one wants to return to the time when we lost two drivers in one weekend so we want make Formula One as safe as possible."
Formula One's technical working group have been given two months to come up with changes to reduce speeds.
If no proposals are forthcoming, the FIA can then impose measures.
Mosley has linked the debate on speeds with his own package of technical measures to be introduced by 2008 to cut costs and attract fresh blood into the sport.
He has suggested, among other proposals, reducing engine capacity from three-litre V10s to 2.4-litre V8s and stripping out expensive electronic systems.