I wanted to re-read this story, which I'm sure I had saved in my Delicious account, only to find that Delicious is no more!  Looking for help - basic plot:    John drops his sons off in a forest one night, with no prior notice, because something evil is in it - it is a test for them?  These rather vague details doesn't  begin to describe this excellent story.  Here's some more info:

This was a multi-chapter epic, maybe 30+ parts
I'm pretty sure the word "highway" was involved
Sam and Dean were barely out of their teens
They encounter spirits/ghosts in the forest, and have hallucinations that seem real to them
This is wincest - the brothers are involved with each other
The spirit is of a settler in the land from 100+ years ago (revealed toward the end)
The boys get separated for a time and one encounters the spirit, who tells their whole backstory

Thanks for any help.  I'm gonna feel really dumb when I'm told the title, which I SHOULD remember.