United States Interstate Highway System
Paragraph 1：The United States Interstate System was initiated in 1956 under a law that outlined a system of more than 40,000 miles of roads from coast to coast and border to border, to link major cities and most state capitals. These highways, over 95 percent complete by 1990, had some important advantages over traditional long-distance routes. Speed was the most obvious one, with a coast-to-coast auto trip that had taken 50 or more days in 1900 down to four or fewer by 1990. Equally important in urban areas, these roads could carry a high volume of traffic, even during congested, peak commuting hours. Safety was a third critical advantage. Since cross traffic was eliminated and opposite direction traffic separated, there were fewer opportunities for collision.
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