I have walked and accidentally driven in such areas in Europe, but the street layout and dynamics are very different in the US. The problem is that in the US we

I have walked and accidentally driven in such areas in Europe, but the street layout and dynamics are very different in the US. The problem is that in the US we have wide, straight streets. We don't have the same kind of built-in traffic calming. There is also much more driver entitlement here. Turning some areas into woonerfs might be a solution. It's also worth pointing out that many pedestrianized areas still allow delivery vehicles.