Esthetics is sometimes a matter of life and death.
So it is with the ribbons of concrete and macadam that twine and tunnel through the U.S. Superhighways are a brand-new form of functional art, with elements that differ from the construction of any roads in history. The wrong kind of curve can be dangerous when one is moving at more than a mile a minute, and no curve at all can be lethal. The new art-science of freeway design forms the most original section of a new book called Man-Made America, by Planners Christopher Tunnard and Boris Pushkarev (Yale; $15).
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