Yep. I can agree with this.
Two points though
1. Electric vehicles are limited by their battery life so maybe have electric cars, vans, buses etc fitted with new design batteries, which would need to give them similar range to an internal combustion vehicle or even look at fitting dynamos to them so that they are continually charging as they drive around. Is this technology available at a reasonable price? Also the manner in which the electricity to charge the batteries would need looking at as it's no use using electricity generated from coal to make 'clean' vehicles as that is counter productive, pollution is still coming from somewhere. Completely agree with you on the school runners in their Chelsea Tractors. Sorting out how to use up less road space is a different problem.
Which leads me on to 2.
Road traffic is still going to be a problem. If cities go vehicle free then better transport networks will be needed to replace them. This means buses and trams in cities, many of which have developed massively since the trams were phased out. In one case, Berlin, Tram lines* were put in when a road was resurfaced in case they were needed. No overhead lines or anything. Then it would mean just doing the junction and putting up the wires or running battery powered trams on that section, a la Wolverhampton.
3. There is no point 3
*I refuse to use the term 'Light rail' and 'Heavy rail' it's railways and tramways.