3 , ▁the ▁United ▁States ▁Road ▁Racing ▁Championship ▁was ▁formed . ▁ ▁In ▁ 1 9 6 6 ▁the ▁Canadian - American ▁Challenge ▁Cup ▁( Can - Am ) ▁was ▁created ▁for ▁Group ▁ 7 ▁open - top ▁sport sc ars . ▁ ▁The ▁Trans - Am ▁Series ▁for ▁p ony ▁cars ▁also ▁began ▁in ▁ 1 9 6 6 . ▁Today , ▁Trans - Am ▁uses ▁GT - 1 ▁class ▁reg ulations , ▁giving ▁amateur ▁drivers ▁a ▁chance ▁to ▁race ▁profession ally . ▁A ▁professional ▁series ▁for ▁open - w heel ▁racing ▁cars ▁was ▁introduced ▁in ▁ 1 9 6 7 ▁as ▁the ▁S CC A ▁Grand ▁Prix ▁Championship .< ref >[ http :// www . my f 5 0 0 0 . com / files / 6 7 _ 6 9 . pdf ▁ 1 9 6 7 ▁S CC A ▁Grand ▁Prix ▁Championship ▁Review , ▁my f 5 0 0 0 . com ] ▁Retrieved ▁ 1 7 ▁June ▁ 2 0 1 4 </ ref > ▁This ▁series ▁was ▁then ▁held ▁under ▁various ▁names ▁through ▁to ▁the ▁ 1 9 7 6 ▁S CC A / US AC ▁Formula ▁ 5 0 0 0 ▁Championship . ▁ ▁Current ▁S CC A - san ction ed ▁series ▁include ▁Trans ▁Am , ▁the ▁P ire l li ▁World ▁Challenge ▁for ▁GT ▁and ▁tour ing ▁cars , ▁the ▁Global ▁M X - 5 ▁Cup , ▁F 2 0 0 0 ▁Championship ▁Series , ▁F 1 6 0 0 ▁Championship ▁Series ▁and ▁the