Transportation in the United States is facilitated by well-developed road, air, rail, and water networks. According to the U.S. Department of Transportation "Transportation’s vital importance to the U.S. economy is underscored by the fact that more than $1 out of every $10 produced in the U.S. gross domestic product is related to transportation activity. This includes all aspects of transportation, including the movement of goods and the purchase of all transportation-related products and services as well as the movement of people." Employment in the transportation and material moving industry accounted for 7.4% of all employment, and was the 5th largest employment group in the United States.

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