> since the 55 mph rule was arbitrarily selected in the early 1970s It was selected in 1974 in response to the 1973 oil crisis in the hope of reducing oil cons

> since the 55 mph rule was arbitrarily selected in the early 1970s It was selected in 1974 in response to the 1973 oil crisis in the hope of reducing oil consumption. 55 was intended as a speed that delivers best mpg for typical 1970s vehicles.