The Knight Bus is a large, violently purple triple-decker bus with gold lettering above its windscreen announcing the name of the bus. When a witch or wizard holds their arm out, even if accidentally, the Knight Bus will appear with deafening noise to collect them. The conductor, Stan Shunpike, wears a purple uniform to match the colour of the bus, and has a number of pimples on his face. The staff proudly boasts of the bus's ability to take its riders anywhere on land, as it did not work anyplace underwater. It costs eleven sickles to ride, but for thirteen one can get some hot chocolate with the ride and for fifteen they will receive an additional hot water bottle and a toothbrush in the colour of their choice.
The driver, Ernie Prang is elderly and does not appear to have mastered the use of a steering wheel; the bus often mounts the curb, forcing lamp-posts and letterboxes to jump away from it and then back into place as it races toward them.