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The cost per passenger per mile is two orders of magnitude lower for roads than for public transit; I can’t imagine parking space accounting for that.

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What is the cost on the road when the road is full and can’t be expanded? Lots of urban areas in the US have this problem.

Parking space and the tracks/roads/right of ways themselves?

I don’t expect it brings them to parity but I expect it’s non-trivial.

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