Why was 55 mph chosen as the national maximum speed law during the oil embargo?

The choice of 55 mph as the national maximum speed law during the oil embargo was primarily based on energy efficiency considerations. At that speed, vehicles tend to achieve a balance between fuel consumption and safe travel. Research at the time indicated that fuel economy improved significantly at speeds around 55 mph compared to higher speeds, where fuel consumption increases due to factors such as aerodynamic drag and engine load.

While the average energy efficiency speed might vary based on vehicle type and design, 55 mph was established as a benchmark that could result in significant nationwide savings in fuel during a critical time of fuel crisis. This decision was made in hopes of reducing reliance on fuel imports and promoting energy conservation, effectively aligning with the objectives of the national response to the oil embargo.

Other options do not accurately represent the reasoning behind this specific speed limit, which stemmed from a careful analysis of fuel efficiency relative to various driving speeds, ultimately leading to the implementation of 55 mph as a means to conserve energy during that crisis.