Driverless cars now out-perform skilled racing drivers, engineers at Stanford University have shown, after pitting their latest model against a track expert. The team has designed a souped-up Audi TTS dubbed ‘Shelley’ which has been programmed to race on its own at speeds above 120 mph at Thunderhill Raceway Park in Northern California. When they tested it against David Vodden, the racetrack CEO and amateur touring class champion, Shelley was faster by 0.4 of a second.