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The economic aspect is also worth considering.

The subsidy per passenger mile in the US is :

0.019 for road transport, 0.021 for air transport, 0.710 for Amtrak and 2.300 for transit.

From : https://ti.org/antiplanner/?p=22592

Just also as a note, you can create suburbs pretty easily where bikes use paths or whatever. I live in a suburb where I can ride 15 kms to work without riding on roads. The subsidy for bikes would actually be really low.

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You should look at Cost benefit analysis, there was one made on Copenhagen. [1] Bicycle infrastructure usually gets you 6x-12x on the invested amount, getting a 1.2 CBA is ok, 2 is amazing.

Bicycle infrastructure is often destroyed by those other investments and that is usually not counted as a con. But it is just too cheap to build bicycle infrastructure to be interesting.

[1] https://www.sciencedirect.com/science/article/abs/pii/S09218...

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