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I think a lot of people, including myself would like for public transport to be so good that people chose public transport whenever possible. I live opposite a school and most parents that drive their children to school absolutely don't need to, so a world without that would be optimal. But there's always going to be edge cases that require supporting.
Funnily enough, I just got back from my daily walk and while strolling, there was an aged car spewing black smoke. It's things like that why, though it's only a stop gap solution, I support stop gap solutions like this. Get old trash off the road.