release. The truck that was purchased to shoot the additional scenes for theatrical release had also featured a 1673B CAT turbocharged engine. Stock footage of both vehicles was used years later in "Never Give a Trucker an Even Break", the seventh episode of the Universal television series The Incredible Hulk, along with a small amount of new footage of a new truck being built up for that episode that was a 1964 Peterbilt 351 that had also featured a Cummins Engine. This displeased Spielberg, but Universal owned the Duel footage, and could use it as they saw fit. Use of sound Mann has very little dialogue in the movie, and the truck driver has none. As Spielberg stated in a behind-the-scenes documentary, he instead wanted to let the vehicles and setting "speak" for themselves. The film was shot on a tight schedule, based on a short story, and needed to fit within the 75minutes allotted by ABC; therefore, Spielberg focused on the visuals and menacing audio. One break from the silences and heavy roar of the vehicles occurs after the initial chase scene, in Chuck's Café. Mann uses the restroom to collect himself and recover from his crash, and the audience is introduced to his inner thoughts. This diegetic use of sound was explained by Spielberg as Mann wanting to "physicalize" and "emote" his feelings, thus giving the audience an intimate relationship with Mann. The use of sound and silence was a technique used by Spielberg to "keep the audience in suspense" throughout the entirety of the film, which he said was inspired by the work of Alfred Hitchcock. According to Spielberg, "sound has to fit like a glove... it makes everything scarier". As an example, towards the end of the film, Mann is awakened from sleep by noise similar to that of the truck, creating in the audience the expectation of a major turning point in the movie. The sound is revealed to actually be a passing train. Along with the natural sounds in the film, Spielberg also incorporated a minimal score. Music The film's original score was composed by Billy Goldenberg, who had previously written music for productions directed by Spielberg, including his segment of the Night Gallery pilot and the Columbo episode "Murder by the Book", as well as scoring "L.A. 2017" with Robert Prince. Spielberg and Duel producer George Eckstein told Goldenberg that because of the