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The fall-protection system for workers on the spire of the 1,776-foot-tall 1 World Trade Center was installed on the 408-foot, 758-ton spire itself. The rigid track system was designed to keep six workers safe and consisted of 1,206 linear feet of horizontal track and 769 linear feet of vertical track. Meanwhile, now that more roofs are being used as outdoor space, fall-protection systems need to be included in building design, says Matt Gillen, deputy director for the National Institute for Occupational Safety and Health.

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