<P> According to the U.S. Department of Transportation (DOT): "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 . </P> <P> The United States invests 0.6% of its GDP on transportation annually . </P> <P> Two - thirds of U.S. oil consumption is due to the transportation sector . The "Energy Independence and Security Act of 2007" has a significant impact on U.S. Energy Policy . The United States--an important export country for food stocks--will convert 18% of its grain output to ethanol in 2008 . Across the United States, 25% of the whole corn crop went to ethanol in 2007 . The percentage of corn going to biofuel is expected to go up . In 2006, U.S. Senators introduced the BioFuels Security Act, which would mandate the production of dual - fuel vehicles and the sale of E85 ethanol fuel . </P>

The united states uses public goods in the global community in order to