Traffic is created by cars, even in city centers. After we've been living with cars for over a hundred years, and most cities are car-centric, some people are slowly starting to realize that cars don't actually belong in an urban space or a city center. And they are not only led to this realization by terrible numbers from the chronicle and the smog indicator. Cars are simply no longer a convenient means of transportation. In London, for example, today, traffic moves slower than a bicycle. So let's take a look at which cities are on the way to making the car "persona non grata".