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> It’s just too big and most places have too low a population density to make it cost effective.

I hear this all the time and it still makes no sense at all. Population goes where transit allows population to go. Cars resulted in low population density. By getting rid of cars, you get rid of low population density.

As for cost, there is no world in which every person owning an automobile is cheaper than public transit. It's not remotely close. Average cost of private car ownership in the US exceeds 10k a year. That's about 3.4T of private spending, or 14% of GDP. This does not include the cost of roads. A single year of private automobile spending would build 20k miles of high speed rail, even assuming costs were CA HSR high.

I feel like the "low pop density & too big" argument is one of those things that only makes sense if you never consider second-order effects.



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