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02/01/1974 New national maximum speed limit

President Richard M. Nixon signs the Emergency Highway Energy Conservation Act, setting a new national maximum speed limit of 55 mph on all interstate roads in the US. The law was a response to the 1973 oil embargo, and its intent was to reduce fuel consumption. However, the law was opposed by motorists and most states.


  • Essentials 

  • Background 

  • Effectiveness of embargo 

  • Chronology 

  • Effects 

  • Decline of OPEC 

  • Graphs and charts