[Freak_NL]

Again, this is a solved problem in countries that have significantly larger pedestrian areas than San Francisco's Market Street. People use a variety of mobility solutions, including wheelchairs, walkers, and mobility scooters.

Pedestrian streets are, on the whole, beneficial to disabled people. There is more space, fewer chances of collisions, and crossing the street is trivial instead of harrowing. Go look in any city that has larger pedestrianized areas and see for yourself: it works for pretty much everyone.