A zip line, zip-line, zipline, zip wire, or aerial runway, is a pulley suspended on a cable, usually made of stainless steel, mounted on a slope. It is designed to enable cargo or a person propelled by gravity to travel from the top to the bottom of the inclined cable by holding on to, or being attached to, the freely moving pulley. It has been described as essentially a Tyrolean traverse that engages gravity to assist its speed of movement. Its use is not confined to adventuresport, recreation, or tourism, although modern-day usage tends to favor those meanings.
