At the Fremont Street Flightline, passengers will leap from a platform 60 feet high and glide 800 feet down one of four lines at speeds of up to 25 mph to a 14-foot-high landing near the performance stage. As with other ziplines, including the ones Greenheart has built in Haiti, Whistler, Canada, San Diego and 30 miles away in rural Boulder City, Nev., riders hang from the steel line in a harness and can speed up or slow down depending on their body position. Precautions are being devised to keep riders from dropping loose items on revelers below.

“The reality is, the world’s most spectacular trails are all in the air,” said Ian Green, co-owner of Greenheart, which also opens a series of four 100-foot-high bridges in the Nyungwe National Park in Rwanda. “They’re trails that give you a very different experience. The experience of flying through something is a lot different.”

Fremont Zipline plans to charge $20 per rider from 6 p.m. to midnight, $15 from 2 to 6 p.m., and $10 per re-ride, although that structure could change.

j vimeo.com/16007028

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