It's never this black and white, also not needed. Usually city centers are closed _for outsiders_, while allowing the residents and local business traffic. This

It's never this black and white, also not needed. Usually city centers are closed _for outsiders_, while allowing the residents and local business traffic. This already curbs the traffic a lot and reduces also a lot the need for a second car lane - or such. Edit: just for clarity: this model is already working (plumbers, movers and locals included).