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Public transport is at least an order of magnitude more efficient: http://p5.focus.de/img/fotos/origs3844236/5854568718-w630-h2... (note that car sizes have increased significantly since then)

Every point you brought forward is also true for subways, but it's again at least an order of magnitude more space-efficient than sending cars through tunnels.



Then think of this as a first-class and/or freight subway, I suppose. An extension of public transport to a new sector.




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