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The Four-Fold doors move horizontally rather than vertically. As a result, the door is visible throughout the opening motion. It is common with overhead sectional and coiling steel doors for delivery vehicles, pickup trucks or even passenger cars to begin driving through the door opening after losing sight of the bottom of the door, only to hit the bottom panel as they move through the opening. A collision of this type will make it impossible to operate the door. In contrast, the Four-Fold door will operate with dents and similar abuse.