As a powerful deterrent to natural play, fear of liability and the law ranks right behind the bogeyman. Parents are afraid to let their kids build a tree house in the backyard. School administrators are afraid to create natural play places… In July 2005… Broward County schools had erected “no running” signs at 137 elementary schools, as one of several steps to cut down on injuries and lawsuits. Playground merry-go-rounds and swings were already history.
– Richard Louv, “The Criminalization of Natural Play: It’s Time to Look for Solutions,” The New Nature Movement (July 16, 2014)