Although the Indianapolis 500, which ran to different regulations, was included in the World Championship each year from 1950 to 1960, it attracted very little European participation and, conversely, very few American Indianapolis drivers entered any Grands Prix.
Aínda que as 500 millas de Indianápolis, que tiña regulacións diferentes, se incluíu no campionato ata 1960, atraia moi pouca participación europea e, pola contra, moi poucos pilotos estadounidenses participaban nun gran premio europeo.