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Racing originated from1894At that time, there were no restrictions on participating vehicles in the competition until1904After the establishment of the International Automobile Sports Federation in, attempts were made to classify and restrict participating vehicles for the sake of fairness and safety. Early classification attempts were made from various perspectives, including maximum vehicle weight, fuel consumption rate, cylinder radius, etc., but the results were not satisfactory until the concept of cylinder capacity was introduced. This is the meaning of "equation": a restriction standard for all participating vehicles.
