The focus after drivers walked the track earlier this week were some of the aggressive kerbs around Singapore's new formula one street circuit.But with three hours of practice under their belts, Nico Rosberg's headache and Adrian Sutil's bruised legs were testament to the new big issue: bumps."It's much bumpier than what we have experienced before," Renault engineering boss Pat Symonds said on Friday. "It reminds me of the North American circuits in the 1980s."F1 veteran David Coulthard expects a lively weekend."It's like the cobbled streets of Paris and very unforgiving. I think there will be a lot of incidents," the Red Bull driver said.Lighting was also a post-action talking point, after organisers' earlier boasts that the circuit would be four times brighter than a typical stadium."When I walked the track I was impressed,...
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