All of the visitor center merchandise is stored on shelves at wheelchair height. No racks with stuff hanging above your head.pic.twitter.com/QtkIgGIsLT
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I'd start by digging around Tourist Attractions and Parks magazine. http://tapmag.com/
Here's a trick I tell people to start their journey into Weird Crowd Control Vision: from any trash can in a public space, you should have clear line of sight to at least one other trash can. This keeps people from having to carry/drop trash, and ensures navigation paths.
more of this! :)
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