In this scene of Escape to Witch Mountain, There are many different motion vector lines, one that is between the driver (Dwayne Johnson) and the children in the back seat. They flip between the front and back seat. The small area makes it easy to establish and the camera location helps to establish the location of the characters in the car and that there is not a person in the passenger seat. The motion vector line is seen during the beginning when he initially gets into the car and they start driving, then after he stops you see the index vertex line. I like this scene for this because it uses multiple lines and is a fast pace scene to watch.