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Daimler CEO Zetsche presents the Mercedes S500 Intelligent Drive car during its world premiere on media night at the Frankfurt motor show

Daimler Chief Executive Dieter Zetsche presents the Mercedes S500 Intelligent Drive car, the first self-steered Mercedes, during its world premiere on media night at the Frankfurt motor show September 9, 2013. The world's biggest auto show is open to the public September 14 -22. At rear, a woman drives a replica of the Benz Patent-Motorwagen, widely regarded as the world's first motor-driven vehicle from 1866. 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.