[strictnein]

Or to start someplace that is much easier to develop, like in Texas. I understand the economics might not be as favorable, but there is a ton of truck traffic going N/S in TX that would be thrilled to skip over (or, I guess under) the major population centers.

[stcredzero]

Making such tunnels electric vehicle only would make them much more economical to build. Guess who is planning electric trucks?