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The rear view of a Smart Fourjoy prototype is pictured during its world premiere at the Frankfurt motor show

The rear view of a Smart Fourjoy prototype is pictured during the world premiere of the four-seater Smart at the Smart Mercedes media night of the Frankfurt motor show September 9, 2013. The world's biggest auto show is open to the public September 14 -22. REUTERS/Wolfgang Rattay (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.