Overheat
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Guy Wadsworth tests a life-saving lamp-post that disintegrates on impact. Tom Ford test-drives the Ariel Atom, which has no doors, no windscreen and no bodywork but accelerates faster than the McLaren F1. And Tiff Needell and Jason Plato go head-to-head in two new American cars - the Corvette C6, which has the biggest engine on sale today, and the Dodge SRT10.