I know the ending your talking about, I've seen it before on a T2 special. It was the original planned ending for the film. However at the last second they decided it was no good, so they filmed a stretch of Highway and gave Sarrah the narration piece. I hope that clears things up for you.
and to everybody else, can't someone ask a question without getting hounded for their film taste? people like all kinds of films for all kinds of reasons. If you can't help answer the post's question, just pass on this discussion!