Get into Tree's
You can T-Bone into the Tree's.

Lag Hole
Required: RPG
Go to the bridge that is broken in half. Then go to the side that is right up against the mountain. then prone and go up against the bridge and get to the most and left and crawl up then take out ur RPG. You should be able to see inside the bridge. Then just run and jump and you will know when your in it. You will be able to see the little room under the bridge but be suspended over it. You can get out just wiggle yourself out then its fine.