Last week I drew your attention the the causes of Too Many Cars, (and, fortunately, no-one reads this blog, so I’m not wading through a bunch of indignant comments about Freedom and Choice). I showed this diagrammatic summary of the ‘vicious circle’:
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Unsurprisingly, there is a corresponding diagrammatic summary of the solutions, the ‘Virtuous circle’:

You will notice that it’s a very similar diagram but with the arrows going the other way. Which implies to me that there are many possible Things That Can Be Done – and the trick might be to operate on many fronts at once.
(Source: the Levett-Therivel sustainability consultants. This graphic is quite well-known, I think, and I found this copy here.