Our land space is getting used up by our transportation system! Highways are now as wide in many places, as they can ever get, but they are still often "choked" due to inadequate number of lanes. To obtain additional rights-of-way to widen the freeways will be extremely disruptive, and take such a long time to implement, that by the time the additional lanes are added they will still be inadequate.
The only reasonable approach is to increase our use of underground tunnels for transportation
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