Ralf Schumacher suffered a nasty crash in the US Grand Prix
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Formula One's governing body has told teams to reduce the speed of their cars for safety reasons.
FIA president Max Mosley has given the manufacturers two months to slow down or changes will be forced upon them.
"That's the immediate priority and maybe out of that will come some ideas to make (further) changes," Mosley said after a F1 Commission meeting.
The FIA is keen to reduce engine speeds to cut the risks of high-speed crashes in Formula One.
Ralf Schumacher remains doubtful for Sunday's French Grand Prix at Magny-Cours after smashing into a concrete wall at Indianapolis on 20 June.
The FIA wants all 10 teams to reduce the engine capacity of their cars from V10 three-litre units to V8 2.4 litres.