It's every traveling family's worst nightmare: a breakdown in the middle of nowhere and being terrorized through the night by a family of hungry, cannibalistic mutants - the most prominent one being played by Michael Berryman (the guy in the poster on the right). He probably looks familiar to you if you grew up watching MTV in the 80s, as he was the principal in Motley Crue's video for "Smokin' In The Boys Room."
I prefer this film to the recent remake, which was much more gory. I felt this one delivered better with tension!
Image source: Wikipedia