Duel is a 1971 television film about a terrified motorist (played by Dennis Weaver) on a remote and lonely road being chased and stalked by the unseen driver of a tanker truck. It was written by Richard Matheson, based on his own short story, and directed by Steven Spielberg in his feature film directing debut. David Mann (Dennis Weaver) is a middle-aged Los Angeles electronics salesman driving his Plymouth Valiant on a business trip. On a two-lane highway in the California desert, he encounters a grimy and rusty Peterbilt 281 tanker truck, traveling slower than the speed limit and expelling thick plumes of sooty diesel exhaust. Mann passes the unsightly truck, which promptly roars past him and then slows down. Mann passes the truck a second time and is startled when it suddenly issues a long air horn blast. The truck follows him into a filling station. While there, Mann makes a phone call to his wife (Jacqueline Scott), who is upset with him for not confronting one of their friends...