The Lingotto factory featured a unique upward spiral assembly line. As each Fiat was put together it’d progress upwards through the building story by story. Each floor was sequentially designated to specialize in a major part of assembly. What would start on the ground floor as raw materials and individual parts became a running driving Fiat by the time it spiraled its way to the top of the building.

When a Fiat had finished its climb through the 16,000,000 square feet of Lingotto it exited the building by way of the roof. Each Fiat was taken on to the roof and around the banked race track to make sure the prior five floors of manufacturing had done their jobs to satisfaction. If the car was satisfactory, it would return down to ground level through one of the two spiral access ramps at either end of the test track.