I visited a ski station in Switzerland during a family trip a couple of weeks ago. Saas Fee, I think it was. No cars in the resort, just electric buggies. You have to park outside the town proper. Even the police were driving buggies. Deliveries were transferred from cars and trucks outside the town. It looked a bit as though the hotels and shops picked up their own stuff from the transfer place. And it was very pleasant to walk around and very safe for the many young cyclists. And it worked. Not possible in the same way for our larger conurbations but many parts of it would work in cities. And once property owners realise that virtually traffic-free streets would add value and exclusivity to large areas of these cities, they'd soon get on board.