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Originally Posted by Doady
mhays explained it quite well above.
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A tunnel would also be unfathomably disruptive. This isn't a tunnel the size of a subway after all, and obviously there would also need to be staging areas to store the tunnel material, a TBM launch and extraction site, and unless it ran express for most or all of the distance then there would need to be entrance and exit ramps as well.
Quote:
Originally Posted by Gresto
In addition to the disruption during construction, for aesthetic reasons. The 401 is ugly enough; a massive scar across the city. A double-decker 401 would be twice as ugly.
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I personally think a double deck highway would look cooler and more urban than a flat sprawled monstrosity. But regardless, it takes a lot more than one option being better than another to justify spending as much on one option as it would to build several of the alternative. I'd be happy spending up to 1/3 more to make the process less disruptive and another 1/3 more to make it more attractive. But to spend 300-500% more would take a heck of a lot more benefits than that.