A simple thriller-movie of a man in his car, vs a crazy, unseen guy driving a semi-truck. For Spielberg's first full-length film, this is amazing. It's so simple, that it works. There's a couple parts where the shadow of the camera ark are seen here and there, but it's excusable, because it's only Spielberg's first movie. And we all know the masterpieces of cinema that were to come later from him!