So you’re in a world-class cosmopolitan city with a fantastic subway transit system. You get your handy-dandy subway map, and you start trying to decipher the tiny little symbols that mean that a particular station is wheelchair-accessible, if the elevator isn’t broken.
Wouldn’t it be easier if someone just erased the inaccessible stations, so you could really tell what the possibilities were? Here it is for London: Accessible Transit – London Underground. Embarrassing, isn’t it?
(Thanks to Christiane for the link.)
2018 update: SMOGR is no more, alas, but here’s a Guardian article that does something similar for a number of cities: Access denied: wheelchair metro maps versus everyone else’s.