Legendary sports car maker Bugatti is to produce the world's fastest road car after a prototype last week exceeded 400kmh on a German test track, silencing critics who predicted the car would never achieve its ambitious goal. The multi million-dollar Bugatti Veyron 16.4 - its name refers to the 16-cylinder, quad-turbocharged engine that has more power than a Formula One car - achieved the feat on a Volkswagen test track. The German car giant bought the famous French Bugatti brand in 1998 and has been working on re-establishing its supercar credentials ever since. Bugatti says the 750kW test car, one...