I was thinking it was common for alleys to have no sidewalks at all, but I looked at quite a few with Google Street View, and many do have sidewalks after all (even on both sides!).<p>An example that I found which seems to have a sidewalk on only one side is Orange Alley, but it&#x27;s complicated: sometimes the single sidewalk disappears entirely, and in tiny patches a sidewalk shows up on the other side. But I think the alleys probably will undermine your clever suggestion.