The Bugatti Veyron lost the title of world's fastest road car (248mph) last year to the SSC Ultimate Aero (an awesome American car I've linked here before), but has now regained the title.
Skip to the 3:00 mark if you want to get to the top speed run and then it's road circuit run.
Skip to the 3:00 mark if you want to get to the top speed run and then it's road circuit run.