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Ramp decking is usually serrated grating, which provides a strong non-slip surface. The open grating allows to breed a fall-through instead of building up on the ramp. There are safety curbs on both sides of the ramp to prevent a forklift from driving over the edge. Handrails are required if personnel will walk on the ramp. A lip at the top end of the ramp supports the ramp by resting on the floor of the trailer. This allows the ramp to float as the trailer height changes due to the weight of the load. Some portable ramps are supported by adjustable legs. Because these ramps don't float with the trailer, they need a leveling device similar to those used with permanent loading docks that can move up or down with the trailer.