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Why are some non-motorized devices such as hang gliders, parasails and bicycles prohibited in wilderness?

Hang gliders and bicycles are considered mechanical transport, methods of transportation prohibited by the Wilderness Act. Both hang gliders and parasails are forms of aircraft, which are prohibited from landing in wilderness. All tend to intrude on the wilderness experience of other visitors. The Wilderness Act recognizes the wilderness resource as a place that "...has outstanding opportunities for solitude..." In most cases there are opportunities for these activities to take place outside of wilderness.