Figure 3 shows how one segment of the flyover works. Flyover shelves are every four inches. The flyover moves tracks from the front of the first shelf to the back of the first shelf. This is the ending of the first and beginning of the second lap. At the end of the second lap and at the beginning of the third lap, the flyover moves the track from the back of the first shelf to the front of the second shelf. Remember each "shelf" has two "laps" so do not use the terms interchangeably.