Dhameystir weedha soo socota: Markii Ururka Baabuurta Mareykanka (AAA) uu ka baxay tartanka baabuurta ka dib xilli ciyaareedkii 1955kii, isagoo tixraacaya musiibadii Le Mans iyo geerida Bill Vukovich
Indianapolis oo ah sababaha wax ku biirinaya, labadaba SCCA iyo NASCAR ayaa lagu xusay inay yihiin kuwa beddeli kara. Ugu dambeyntii, USAC waxaa aasaasay milkiilaha Indianapolis Motor Speedway Tony Hulman. Waxay noqotay garsooraha xeerarka, naqshadeynta baabuurta, iyo arrimo kale oo loogu talagalay waxa ay ugu yeertay tartanka baabuurta ee horyaalka, heerka ugu sarreeya ee tartanka USAC. In muddo ah waxaa jiray taxane gaar ah oo qeexitaanno ah oo loogu talagalay gawaarida horyaalka ee loogu talagalay in lagu ordo carrada, halkii ay ka noqon lahaayeen waddooyin laami ah.