[hinkley]

Metros are in tunnels.

There’s only so much gridlock you can avoid without going above or below grade. I was shocked when I moved to Seattle and they had no subway system. It was made even worse by being crammed up against a tall hill with a ridiculously deep lake behind it. They are finally changing it now but I’d spent time in Tokyo before, and time in London and Paris shortly after and it was a real head scratcher. One bus tunnel helped, as was evidenced when they shut it down for a couple years, but cmon.

[alterom]

Seattle also is a great example of "why tunnels for cars are not tantamount to a public transport network".

As well as all the impediments to the glorious vision of the parent commenter's "tunnels everywhere" as a panacea.

[panick21_]

Yes, WHEN you build tunnel you need to make it the highest possible capacity. And not some low capacity tax system.