Tokyo has tons of elevated and undgerground pedestrian walkways, including in some of the most fashionable/popular/heavily-trafficked (by pedestrians) areas, e.

Tokyo has tons of elevated and undgerground pedestrian walkways, including in some of the most fashionable/popular/heavily-trafficked (by pedestrians) areas, e.g., around Shibuya station. An interesting extreme case is the south-east side of Yokohama station, where they (stupidly) put in one the most insane messes of concentrated roadways I've ever seen [not just 8+ lane roads, but 4-5 vertical levels of roadways!]. The area also has extremely heavy pedestrian traffic, which essentially all happens underground or on elevated walkways; basically nobody walks at ground level any longer. This may sound horrible, but in fact it's pretty nice ... you really don't realize what a mess it is unless you look back from a distance. In both cases, the retail has followed the pedestrians under or over the ground...