When it was built in the 1920s in Turin, Italy, the Fiat factory was designed with a racetrack on the top of the building, both for car testing purposes and for racing.
The factory’s best-known symbol is the test track, which is a superb piece of design modeling, and construction that occupies the whole roof surface of the workshops. Two 443 meters straights, joined by parabolic bends, form a continuous track for testing the cars.
Originally, as soon as the cars left the assembly lines they could flow directly upward to the test track through the snail-shaped ramps completing the whole processing cycle inside the factory. Moreover, these spiraling ramps inside the building allowed the cars to be driven back down and into showrooms.