As I've stated in the threads to do with related 'green' issues, the laudable aim to reducae pollution in built-up areas by such means has negative consequences for the least well off who make up the vast majority of the owners of the vehicles that are banned or priced off the road.
To me, it is of little consolation that they could use 'cheap' (fares) public transport, as many journeys are not appropriate (e.g. load carrying needed or route is way too long [not direct/many changes - > time-consuming) and the person cannot afford the extra time or to use a taxi/mincab or hire a car on a regular basis.
I think that changes in rules/legislation needs to be far more 'organic' over longer periods to allow society to be able to adapt with minimal pain / cost. This would include better planning for viable alternatives and some stop-gap measures, including car-sharing and better road / junction design that allows for better flows, thus reducing pollution without harsh personal penalties on people who are least able to adapt without real hardship.
Not 5exy policy-making, but a common-sense approach might go a long way to alleviate problems, give time to instutute more thought-out longer-term plans and to help improve the (current very low) opinion of the great and good.
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