Re: On foot, on crutches, in wheelchairs
True, as far as on the road is concerned. Pavements etc, not so much. At junior school, the rule was keep left when moving about the school corridors. At secondary school, not only was the rule "keep right", but it was signed as such all over the place. As for out in the real world, I find the vast majority of people walk "where the hell they like" but through a system of learned behaviour, unwritten rules and fleeting eye contact, most people manage perfectly well. But, of course, there are always twats. There always will be.
On really busy pavements, somehow the crowd seems to work out that everyone going in the same direction should be on the same side of the pavement, which mostly works. Except there are "junctions" frequently along the route as people need to go look in a shop window or go into/out of a shop, which can be a little awkward at times if your direction of travel is on the outside and someone is speed-walking with a large parcel! :-)