It could be a bit naive idea, but with all existing huge railway track laying machine and giant tunneling machine why there is still no such thing for usual roads.
http://www.youtube.com/watch?v=_MKcTbYDP7w
tunnelling machines
http://www.youtube.com/watch?v=z38JIqGDZVU
Even though it could be adopted for traditional rock + sand bedding and asphalt surface roads I suggest to have shallow water like small bridges (only small piles every 5 m)
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