I don't personally have a major objection to levies for driving around in big, congested cities.
But that would be with a major proviso - provision of a comprehensive infrastructure of cheap, reliable, frequent public transport and safe places to park your own vehicle(s) outside the boundaries.
But outside of London, and a handful of other regional 'cities', public transport is pretty woeful nowadays - and not cheap!
First big drawback: current provision of decent, affordable public transport in th UK lies firmly in the realms Cloud Cuckoo land.
We're going to be end-to-end tarmac across the land if roads expansion continues as it has been.
And then the huge, thorny question is - how many of us would be prepared to give up our private vehicles?