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U.S. law of 2 January 1974 that set a national maximum highway speed limit of 55 miles per hour.

2 Jan 1974

Emergency Highway Energy Conservation Act. U.S. law of 2 January 1974 that set a national maximum highway speed limit of 55 miles per hour.

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Pictures, from Wikimedia Commons: Richard Nixon, Department of Defense. Department of the Army. Office of the Deputy Chief of Staff for Ope, Public domain.