The Virtual Safety Car concept gained the cautious endorsement of leading drivers after it was tested during Friday practice at the Circuit of the Americas.
In the F1 Fanatic round-up: Three-team boycott denied • Ecclestone expects more team failures • Frank Williams in hospital
Nico Rosberg may been pipped to the day's fastest time by three-thousandths of a second, but the sector data shows he has some time in hand.
Slippery track conditions caught several drivers out in practice, among them Romain Grosjean, who surprisingly sported a Matt Le Blanc-themed helmet.
Top teams remain sceptical over the viability of a budget cap because of the difficulty of enforcing it on their complex business structures.
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