The US Department of Transportation is headed by the Secretary
of Transportation.
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The US Department of Transportation is a government department,
not a market monopoly
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The Transportation Security Administration (TSA) began as part
of the Department of Transportation (DOT) but was moved to the
Department of Homeland Security (DHS) when that department was
created.
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California Department of Transportation was created in 1895.
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Arizona Department of Transportation was created in 1974.