Vanishing point is clues as to direction of road as soon as possible. Be it the edge of the road, tree lines, power lines, or anything that may be an indicator. Heck, sometimes it's a lack of something. Example, you come around a corner and off in the distance you see the right lip of the road longer than the left, indicates a left handed corner. Nothing rock solid, but helpful in setting up early for the next bend in the road.