Lightning McQueen is trying to win the Piston Cup when he becomes stranded near Radiator Springs in Pixar's Cars.
At the beginning of the film, Lightning is one of three cars tied for the Piston Cup championship. The decisive race is scheduled at the Los Angeles International Speedway, but Lightning's impatience causes him to become separated from his transport truck, Mack. His detour eventually leads him to Radiator Springs.
The Piston Cup is the film's fictional stock-car racing championship. Lightning, Chick Hicks, and The King compete in the final race, where Lightning makes a crucial decision that reveals how much he has changed.
The Dinoco 400 is an earlier race in the story, and the Florida 500 belongs to Cars 3. The World Grand Prix is the international competition in Cars 2, so none of those titles describes Lightning's opening goal in the first film.