They can go into cheap, boring tunnels (little ventilation requirements) | Hacker News

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		dzhiurgis 28 days ago \| parent \| context \| favorite \| on: NYC congestion pricing cuts air pollution by a fif... They can go into cheap, boring tunnels (little ventilation requirements)

bmicraft 28 days ago [–]

They can't (fire safety requirements make all tunnels expensive)

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