There are arm-propelled bicycles (or more specifically, drivetrains that let wheelchair users propel themselves with their arms as though they are on a bicycle)

There are arm-propelled bicycles (or more specifically, drivetrains that let wheelchair users propel themselves with their arms as though they are on a bicycle). If you're going into "paraplegic and/or legally blind" as your idea of people that can't get around by bicycle, you will find that most people in public gatherings are just fine going around by bike.