Pedzisa mutsara unotevera: Kirasi yemotokari yemasheya yakatanga sechikamu cheAAA Contest Board. AAA yakasarudza kurega kubvumidza makirasi ose emijaho pashure porufu rwaBill Vukovich pa
Indianapolis 500 ya 1955 yakateverwa zvikuru nenjodzi yeLe Mans ya 1955. USAC yakatora chirango mumakirasi avo ose kutanga muna 1956.