Preventive search and rescue is a movement that promotes safety in arduous environments. For example, Yosemite National Park (California) focuses on educating visitors to use backcountry common sense, swift water safety, and public enjoyment of waterfalls from a distance. Yosemite implemented a permit system for climbing the popular Cable Route up Half Dome in summer 2010 in response to multiple fatalities from overcrowding. Delaware Water Gap National Recreation Area (Pennsylvania and New Jersey) uses PSAR to address water safety and proper use of personal flotation devices in an attempt to reduce the number of drownings. At Grand Canyon, PSAR was established in 1997 with the mission of reducing visitor injury, illness, and death during the hottest summer months.
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