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A look at technology that is finally, slowly but surely, being utilized in the U.S., which has been used in other parts of the world for years.
At intervals inside the elevated roadway's box girders...are anchor blocks, called deadmen, cast into the structure. They are meant to be used decades from now, perhaps in the next century, when in their old age the concrete girders will start to sag. By running cables from deadman to deadman and tightening them, workers will be able to restore the girders to their original alignment.
A domestic engineering feat that is projected to last over a century.
