I live in Seattle. We implemented the 25mph rule and it does seem to actually be helping. This is after a lot of attempts at improving pedestrian safety failed to have any effect. It’s irritating because it seems like it takes forever to drive anywhere in this city, and there are definitely a lot of corners cut in infrastructure that could improve safety—including very simple things like adding more marked crosswalks and stop signs at uncontrolled intersections—so I consider it a mixed bag overall.