Duel is a 1971 American road action thriller film directed by Steven Spielberg in his feature film debut. It centers on a traveling salesman David Mann driving his car through rural California to meet a client. However, he finds himself chased and terrorized by the mostly unseen driver of a semi-truck. The screenplay by Richard Matheson adapts his own short story of the same name, published in the April 1971 issue of Playboy, and based on an encounter on November 22, 1963, when a trucker dangerously cut him off on a California freeway.