James Cameron referred to Aliens as forty miles of bad road in the intro to the DVD Special Edition:
"What you're about to watch is the Special Edition of ALIENS. I actually preferred this version to the Release version because I think, as it's been best described by one of my friends, 'it's 40 miles of bad road.' And, I think it's a longer, more intense, and more suspenseful version of the film. The conventional wisdom at the time was: don't make the film too long, but at 2 hours and 37 minutes, this is the ride that we intended you to take."
What does this expression mean, and how does it relate to the film?
Has Cameron ever said that he felt the film was bumpy, disjointed, uncomfortable? Images the phrase '40 miles of bad road' evoke?
The only thing I have been able to find is a song from the 50s and I am sure this isn't related. Is there any further information given by James Cameron on this quote?