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> Why couldn't you just build transit that's above or below the existing space for cars instead?

It's basically free to paint a lane red and declare that it's only for buses. Tunnels can cost billions per mile.

It's free in terms of direct monetary cost to do, sure. But there's a very high cost of banning cars from a lane, borne by everyone who used to use that lane but can't anymore.

Alternately: there's a high cost to not creating a dedicated bus lane paid by everybody who rides the bus or chooses not to ride the bus because it's too slow.

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