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3 - Security
Ensuring security of all transportation systems and
the people who use them is a national priority. While
much of the initial national focus after the September 11,
2001, terrorist attacks was on aircraft and airports,
attention is also directed at other modes, including rail,
water, highways, and pipelines. Another security issue is
the U.S. dependency on foreign sources of oil. The U.S.
transportation sector remains almost entirely dependent
on petroleum as an energy source and nearly two-thirds
of the petroleum used in the United States is currently
imported.
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