An automobile manufacturing line is provided which comprises a first assembly line, a second assembly line positioned parallel to the first assembly line on one side thereof, and a third assembly line positioned parallel to the first assembly line on the other side thereof. A first conveyor is located between the first and second assembly lines for carrying workpieces from the end of the first assembly line to the beginning of the second assembly line, and a second conveyor is located between the second assembly line and the third assembly line for carrying workpieces from the end of the second assembly line to the beginning of the third assembly line. The first assembly line, the first conveyor, the second assembly line, the second conveyor, and the third assembly line are arranged in a substantially spiral configuration. The first and second conveyors are overhead conveyors such that parts and workpieces can be transported to the assembly lines by passing underneath the conveyors.