Early road construction was time-consuming and expensive. In 1959, road crews could lay out one mile of road a day at best. With today’s technology and equipment, paving and grading roads is much easier and faster. Construction of bridges required specialists who could design the river-spanning lengths. In the 1960s, road construction cost $400,000 per mile of four-lane highway, including the cost of land, equipment, workers’ pay, bridges, and materials. Today, roads cost more than four times that for two lanes in one direction, but they last 50% longer
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