美国本土上面最为重要的道路为美国州际公路系统（interstate highway system），这是由一个横平竖直的网格搭建而成的公路网路，南
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又宽又直、拥有四车道的州际公路Interstate Highway System（州际高速系统）的逐步建成， 沿着地形而修、起伏弯曲的66号公路不再受旅客青睐，逐渐沦落为地方公路、私人车道，甚至遭到遗弃不再使用。
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The major work on the Interstate Highway System was completed around nineteen-ninety.
VOA: special.2010.01.11
We built the transcontinental railroad, the Interstate Highway System, the Hoover Dam, Grand Central Station.
WHITEHOUSE: President Obama on Retaining Teachers and the American Jobs Act | The White House
It was Eisenhower who launched the Interstate Highway System and new investment in scientific research.
WHITEHOUSE: President Obama Speaks at the Associated Press Luncheon
President Dwight Eisenhower's Interstate Highway System had positive multiplier effects for the American economy.
FORBES: America's Dead Wealth Problem
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