This is how it's done http://www.dw.com/en/online-map-shows-wheelchair-accessible-locations-worldwide/a-15381244
I met this bloke at SOTM Japan some years ago. He didn't put out a questionaire about whether non-disabled persons tended to tag less accessability tags than disabled persons, because he already knew the answer. He just went out and mapped them, created a website to support his interest and got thousands of people interested in his project. Truly an inspirational mapper.
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