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Audi CEO, Rupert Stadler presents the new "Audi Nanuk" at the Volkswagen group night at the Frankfurt motor show

Audi CEO, Rupert Stadler presents the new "Audi Nanuk" at the Volkswagen group night at the Frankfurt motor show September 9, 2013. The world's biggest auto show is open to the public September 14 -22. REUTERS/Ralph Orlowski (GERMANY - Tags: BUSINESS TRANSPORT)

World's biggest auto show in Frankfurt

Car makers and enthusiasts gather at the world's biggest auto show in Frankfurt, which will open to the public September 14 -22.