The walls aren't perfectly vertical. Go fast enough and a car will be okay. Should be easier with a lighter car. As has been mentioned, a greater challenge would be making sure that the engine is lubricated and the fuel pickup point is OK.
Quote:
If a Koennigsegg (spelling) can drive upside down, then I have reason to believe its possible to drive on sideways like these cars.
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I don't know how much downforce the Koenigsegg makes -- I doubt it's enough for it to drive upsidedown. A F1 car could, in theory, drive upside down, but
afaik it hasn't been done before.