The Bugatti Veyron is the fastest car in the world that is street legal. The original Veyron officially recorded an average top speed of 253.81 mph (408.47 km/h) on a test track (on April 19, 2005).
On 4 July 2010, Bugatti's official test driver Pierre Henri Raphanel piloted the Super Sport edition and was clocked at an average of 431.072 km/h (267.856 mph) on the same track, taking back the title from the SSC Ultimate Aero TT as the fastest production vehicle of all time. The 431.072 km/h mark was reached by averaging the Super Sport's two test runs, the first topping out at 427.93 km/h (265.90 mph) and the second at 434.20 km/h (269.80 mph). The record run was certified by the German government and the Guinness Book of World Records.
The car's everyday top speed is listed at 350 km/h (220 mph). When the car reaches 220 km/h (140 mph), hydraulics lower the car until it has a ground clearance of about 9 cm (3.5 in). At the same time, the wing and spoiler deploy. In this handling mode the wing provides 3,425 newtons (770 lbf) of downforce, holding the car to the road.