Designed by the Bureau of Public Roads between 1929-32, Cadillac Mountain Road is an extraordinary example of construction in a mountainous terrain. The road maintains a positive grade for its entire length and includes spiral transition curves, which were an adaptation from the old railroad route up the mountain, to give a smoother ride between the road's straight and curved sections. Guardrails were fashioned by spacing three-to-four-foot angular coping stones along the edge of the road approximately four feet apart.
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