A vanishing point is a point in a perspective drawing to which parallel lines not perpendicular to the image plane appear to converge. The number and placement of the vanishing points determines which perspective technique is being used. The concept was first used by Renaissance artists such as Donatello and Masaccio.
Vanishing points can also refer to the point in the distance where the two verges of a road appear to converge. This is often used to help assess the upcoming curves in the road; to judge the radius and therefore the entry speed and optimum line. If the vanishing point moves towards you or to your sides, the curve is tightening. If the vanishing point moves away from you or comes to center, the curve is straightening.