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Audi and RedBull tackle the worlds steepest public street. To make conditions even harder, the 37 degree street is prepared with snow, sand, mud and gravel. RedBull athletes Bene Mayr (GER), Heikki Sorsa (FIN) and Aaron Gwin (USA) challenge the street from above, while Mattias Ekström (SWE) gives them a lift in the Audi A4 quattro.