The film is set on Interstate 5 in California on the day of July 4, 24 hours before the summer vacation will officially commence.
Interstate 5, commonly referred to as "the 5" by people from Southern California
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The El Toro "Y" is a freeway interchange in southern Orange County, California where the Santa Ana Freeway, Interstate 5 (I-5), and the San Diego Freeway, the I-405 merge.