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1 giorno fa · January 2, 1974 (Wednesday) The U.S. maximum for the next 13 years. The maximum speed limit on U.S. highways was lowered to 55 miles per hour (89 km/h), a limit that would remain in effect for the next 13 years, in order to conserve gasoline during the OPEC embargo. [ 32] The decrease in the speed limit (which had been 70 miles per hour (110 km ...