In a dense enough place with narrow streets you can just walk on the road. A lot of old towns are like this. In montreal there is an extensive system of back l

In a dense enough place with narrow streets you can just walk on the road. A lot of old towns are like this. In montreal there is an extensive system of back lanes, and I did a lot of my walking there, no sidewalks. The lanes were shared by cars but they were slow and infrequent.