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Introduction to Transportation Engineering - Air Transportation ...

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U.S. <strong>Transportation</strong> Infrastructure• 6.9 million km of street, roads, and highways,• More than 575,000 bridges,• 240,000 kilometers of railroads• 41,000 kilometers of navigable channels• 200 large ports• More than 20,000 airports• Estimated Cost: >$70 trillion dollars2

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