These big expensive saloons tend to be spared independent crash testing, but considering the strong performance of Audi's cheaper models, along with the extensive safety equipment, you can assume the S8 is very safe. As well as driver and passenger airbags, there are four side airbags and curtain airbags covering front and rear occupants.
The boot is huge and opens and closes automatically at the touch of a button or the remote key fob. There are pop-out door bins in the all four doors, a good-sized glovebox and additional storage space within the single rear and twin front armrests.