I co-created this, the same thought has been on my backlog for a while. We've experimented with Linked Data/Schema.org compatibility – if this is related to your work, I'd love to move this issue forward. If this is your aim, let's talk (sebastian@sozialhelden.de) :)
Re: US ADA Symbols: https://github.com/schemaorg/schemaorg/issues/254#issuecomme... :
Accessible tourism https://en.wikipedia.org/wiki/Accessible_tourism
ADA signs https://en.wikipedia.org/wiki/ADA_Signs
International Symbol of Access (wheelchair sign) https://en.wikipedia.org/wiki/International_Symbol_of_Access
...
"Find wheelchair accessible places with Google Maps" (2020) https://blog.google/products-and-platforms/products/maps/whe...