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A comment on Tunnel Boring Machines (2018). Parent comment

Re:Tunnel Boring Machines (2018) by imtringued on Monday November 18, 2019 @06:27AM (#21563444)
Actually the problem with congestion stems from the fact that buildings are 3D but roads are 2D. If you want to house more people then you can simply build higher but you can't do the same with roads.
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Re:Tunnel Boring Machines (2018) by mrep on Monday November 18, 2019 @07:02AM (#21563613)
Says who? I grew up in chicago where not only do we have an elevated subway [0] but we also have some double decker streets such as wacker drive [1].

[0]: https://en.wikipedia.org/wiki/Chicago_%22L%22

[1]: https://en.wikipedia.org/wiki/Wacker_Drive

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Re:Tunnel Boring Machines (2018) by bluGill on Monday November 18, 2019 @08:43AM (#21564214)
We can of course build 3d. However the costs of building 3d is vastly more than building 2d. Thus we generally prefer to build mostly on the surface unless forced to do something else.
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