Narrow roads should be a sign of planning. They do a far better job of restricting vehicle speeds than a nice wide open straight road with a 25mph (or equivalent) speed limit sign. My US city would benefit from far more narrow roads. But even the “quaint and quiet” residential streets are so wide that cars feel comfortable flying through at double the speed limit. And I’m not talking about the occasional reckless driver. This is how the standard traffic flows because they have so much space and open sight lines. We have nothing in the way of traffic calming for pedestrian interactions. Posted speed limits are the only mechanism used to designate road speed. It doesn’t work.