Phasing cars out of a city centre by logical year on year enforcement is one thing, and with a 40 year plan to develop public transport and make a transition to electric carts would seem to make sense.
Taxing them out is just is another way of giving the EU more money to squander on wasteful and pointless projects that have nothing to do with green issues and undoubtedly will result in a new department of something or another, requiring a huge annual budget that'll never be enough like with the director of the department something or another's salary.
The possible banning of vehicles from cities as been on the cards for ages. The major city that I live near undertook some serious 'secret' testing and experiments about 10/12 years ago, in respect of vehicle usage. This was a scheme that was funded from central government to the tune of many thousands of pounds. Most of the test scheme were conducted by selected council officer's and councillor's, with the remainder from a select band concerned about transport for the future.
The report of those involved never really got published, but what was leaked, all pointed to major changes ahead for transport, especially the private vehicle owner.
I think that two other larger cities were involved in this experimental scheme. No reports seem to have been published for public consultation, so I guess the scheme is still under review?.
I recall in my travelling days, how a couple of countries were experimenting, and had certain restrictions on certain days for transport. Certain types of number plates could only be on the road on certain days, and other types of number plates on other days. It seemed to work, mainly due to vehicle sharing, lack of road congestion and the like.