It’s an easy equation: space that we’re dedicating to cars (driving or parking) is lost urban living space.
To give you an example: one car occupies about 15 square meters, one parking spot could provide space for 10 bicycles. And remember, for one car there is the need for at least two parking spots- one at your starting point and one at your destination.
Apart from all these arguments, space allocation in cities simply boils down to their liveability: The space used for car parking or wide car lanes could be re-used making the city a more beautiful place to live and stay in. Whether it would be areas for alternative modes of transportation (like bicycles) or replacing parking lots with playgrounds and housing. If you’re being perfectly honest, even as a car driver you prefer cities that are not built around cars – or did you ever go on holidays in a city because you just loved how well you could drive around in it? Car-free urban areas allow us to give the cities back to whom they really belong: the people.