Julie Brooks-Girskiene unless the city has a good public transport system,
Piri And of course depends how big city is and the city planning.
This is why it seems like it would be much easier for big cities, London, Paris, etc. to go car free in their centres than smaller ones. Big cities have enough people using the public transport at all hours and in all directions to make it cost-effective. For smaller cities it is much harder to cover the cost of running a train/metro/bus/whatever to a part of the city that is less busy and with low passenger numbers.
I think it also depends on exactly how big an area in the city centre we are talking about, is it an easily walkable area or is it big enough that people need transport.
In any case most people would argue that there have to be exceptions for people who live in that area or who own businesses there and need to bring products in and out.
I love the principal of having as many car free, or at the very least low car, areas in every city, but it has to be done in a way that doesn't disrupt life massively.. That's very doable, it just needs some thought.