Creepy Thriller that you won't be able to Put Down!

This is a very creepy YA horror book with a mysterious ghostly road that according to legend, shows up once every year. A sister is convinced that her missing sister is on the road and convinces a group of her friends to join her in looking for Becca when the road appears. The plot is sort of gory and many of the kids die during the book. It is both dark and atmospheric. I would compare it to a teenage Blair Witch Project. I have no clue what happened at the end, and I'm still confused. Great story idea, but also a bit too much at times. The book could have been a tad bit shorter and been even better. Not the worst I've read, but not the best horror option either. The story unfolds in alternating viewpoints which adds another layer to the mystery.