Brazilian novice Lucas di Grassi was unveiled on Tuesday as ex-Toyota driver Timo Glock's team-mate.
The team's English driver Jenson Button led team-mate Rubens Barrichello to a one-two in qualifying on Saturday and is the pre-race favourite for Sunday's Australian Grand Prix.
Roberts was co-driver in a Peugeot 207 being driven by Irish team-mate Craig Breen - who was unhurt - when the crash happened at Cefalu on Sicility during the Targa Florio event.
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So inevitably if you ask your driver not to drive into his team-mate that could be a team order.
The new layout was met with a generally positive response from those at the circuit including Red Bull driver Mark Webber and his former team-mate, now a BBC pundit, David Coulthard.
But he won more races than any other driver, put his world champion team-mate in the shade more often than not and was untouchable in Bahrain and Valencia, and unlucky in Hungary and Singapore.
The Brawn driver finished only seventh in Sunday's European Grand Prix as team-mate Rubens Barrichello won the race to close to within 18 points.
Davidson, who tested for BAR last season, was promoted to third driver after Sato succeeded former world champion Jacques Villeneuve as Button's team-mate for the 2004 campaign.
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Removal of the two driver aids was weighing on a number of minds, including Heidfeld's team-mate Robert Kubica.
Hearts could have doubled their lead shortly after the break when Driver crossed for Nade, but the Frenchman's effort was blocked by team-mate Wallace.
The McLaren driver dominated the race at Shanghai while his title rival Felipe Massa was handed second place by Ferrari team-mate Kimi Raikkonen.
"I have been a team-mate with Lewis before so that wouldn't be a problem, " said the Williams driver, who partnered the Briton in go-karts as a teenager.
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