brake failure, an anti-lock braking system (ABS) has also been installed on the handbrake. Prototypes have been subjected to repeated 1.0 g braking from to without fade. With the car's acceleration from to , that test can be performed every 22 seconds. At speeds above , the rear wing also acts as an airbrake, snapping to a 55° angle in 0.4 seconds once brakes are applied, providing an additional 0.68 g (6.66 m/s2) of deceleration (equivalent to the stopping power of an ordinary hatchback). Bugatti claims the Veyron will brake from to a standstill in less than 10 seconds, though distance covered in this time will be half a kilometre (third of a mile). Special editions Bugatti Veyron 16.4 Grand Sport (2009–2015) The targa top version of the Bugatti Veyron EB 16.4, dubbed the Bugatti Veyron 16.4 Grand Sport, was unveiled at the 2008 Pebble Beach Concours d'Elegance. It has extensive reinforcements to compensate for the lack of a standard roof and small changes to the windshield and running lights. Two removable tops are included, the second a temporary arrangement fashioned after an umbrella. The top speed with the hardtop in place is the same as the standard coupé version, but with the roof removed is limited to —and to with the temporary soft roof. The Grand Sport edition was limited to 150 units, with the first 50 going exclusively to registered Bugatti customers. Production began in the second quarter of 2009. Special editions Bugatti Veyron 16.4 Super Sport, World Record Edition (2010–2011) The Bugatti Veyron 16.4 Super Sport is a faster, more powerful version of the Bugatti Veyron 16.4. Production was limited to 30 units. The Super Sport has increased engine power output of at 6,400 rpm and a maximum torque of at 3,000–5,000 rpm and a revised aerodynamic package. The Super Sport has been driven as fast as , making it the fastest production road car in the world at the time of its introduction although it is electronically limited to to protect the tyres from disintegrating. The Bugatti Veyron 16.4 Super Sport World Record Edition is a version of the Bugatti Veyron 16.4 SuperSport. It is limited to five units. It has an orange body detailing, orange wheels, and a special black exposed carbon body. The electronic limiter is also removed with this version. The model was unveiled in 2010 at The Quail, followed by the 2010