In the UK, they are a hot topic at the moment, but they have been around forever such as this example from Leicester which has been in for so long, the trees within it are mature;
link to original articleLTNs cannot transform places on their own; main roads need dealing with to make walking and cycling safer along them for the simple reason of that’s where many shops and services are located. However, LTNs are fundamental part of urban traffic management policy (in the widest sense) in places which try to give people genuine choices about how they travel their shorter trips.
