During the race, Gagné is shown blocking Turbo by weaving left and right so Turbo can't get around him. In the Indy league, as well as most professional and amateur racing sanctioning bodies, this is considered illegal and Gagné would've been black-flagged and brought in to the pits for a penalty. You are allowed one lateral move and that's it, a 2nd move is considered "blocking" and is illegal.