[bgnn]

My city, Utrecht, in the Netherlands is quite close this. No cars in the city center, no diesel vans for delivery, only busses and taxis can drive in certain roads in the center, bikes have priority on most roads cars can drive outside the center, mow they are reducing the speed limit to 30km/h everywhere in the city (following Amsterdam on this), and they are building a new car-free neighborhood for 40k people with no parking spaces and car roads.

[Ekaros]

Good first steps. Next is to get rid of those busses and taxis too. And truly open all roads to be freely used by pedestrians. Or even densification. You could fit buildings there for more people to live in. Then gradually expand this area so you have some reasonable like 40 km super block with no vehicles.