On TV they have just had a documentary about the FIAT test track that was built on top of the factory at Lingotto in Turin. I have never heard of this before and looked up a few things on the interweb.
As far as I can see the track was used from about 1920 to about 1980 when the manufacturing was moved to a new factory. It is still in use for rallies of classic and vintage cars. It is a one kilometre long ring with steeply sloping parabolic curves at the ends.
It is a bit difficult to find anything in English on this but the film hardly needs translation.
This is a 360° video which is best watched in the YouTube app - amazing
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