When I grew up in Europe in the 1970s and 1980s, there was a noticable shift in public opinion away from support for traffic-enabling policies towards support for traffic-restricting policies. This manifested itself in numerous construction projects all over the continent with the objective not to build something, but to “unbuild” (Rückbau). Communities began to reclaim space in residential areas from traffic by narrowing streets, adding islands with trees and plants, raising cross walks, adding speed bumps, building bike paths, and introducing and rigorously enforcing lower speed limits.
The term used for this type of road redesign was traffic-calming – “Verkehrsberuhigung”.
Speed limits in areas that were redone in such a fashion were generally 20 mph (30 kph) or less.