A transportation vehicle, also called a hovercraft, that rides slightly above the Earth's surface on a cushion of air. The air is continuously forced under the vehicle by a fan, generating the cushion that greatly reduces friction between the moving vehicle and the surface. The air is usually delivered through ducts and injected at the periphery of the vehicle in a downward and inward direction. The design of the vehicle's underside, combined with seals or skirts attached below the hull around the perimeter, restrains the air, creating the cushion. Because the vehicle is not in contact with the surface, it has six dimensions of motion.