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One stops the disk by stepping off the accelerator strips, which brings the disk to a smooth halt depending on the area available for braking. - (Priest-Kings of Gor, Chapter 17, Sentence #65)

Part of the time we rode on a transportation disk, and he showed me how to operate it. The disk flows on a tread of volatile gas and is itself lightened by its construction from a partially gravitationally resistant metal, of which I shall speak later. Its speed is controlled by the placement of the feet along double accelerator strips which lie flush with the surface of the disk; its direction is controlled by the rider, who bends and turns his body, thereby transmitting force to the lightly riding disk, the principles involved being no more unusual than those employed in such homely devices as roller skates or the now vanishing skate boards once popular with Earth children. One stops the disk by stepping off the accelerator strips, which brings the disk to a smooth halt depending on the area available for braking. There is a cell in the forward portion of the disk which casts an invisible beam ahead and if the area for stopping is small, the stop is accordingly more abrupt. This cell, however, does not function if the accelerator strips are depressed. I would have thought that some type of cells for avoiding collisions when the accelerator strips are depressed might have been useful or that a bumper of gas, or a field of some sort, might have been practical improvements but Sarm felt that such refinements would be excessive. - (Priest-Kings of Gor)