It's an adult playground. Schoolchildren cannot reach those high bars. If you live in the US you won't see too many of these but you will see plenty of golf courses.

"We should project our thoughts ahead of us at every turn and have in mind every possible eventuality instead of only the usual course of events." -(Seneca/2)

for anyone not in the loop a description would constitute a potential spoiler if they ever stumble into the source material - spoilers reduce enjoyment