> I want public transportation infrastructure and far, far, FAR fewer cars. I think the US should strive to reduce car ownership by 75% over the next 20 years, at least in cities over a certain population size.

Do you want to limit the cars people own or do you want to limit how much cars are used?

I could reduce the number of my cars to 1 and wouldn't be driving any less. Or I could buy more cars and still would not be driving more than I do today (but might be able to choose a smaller more efficient one for a trip).