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A model poses next to an IAT (International Application Technology) Zu electric concept car, designed by IAT (China) Automobile Technology, at the Beijing Auto Show in Beijing April 23, 2010. China overtook the United States as the world's biggest auto market in terms of number of vehicles sold in 2009, helped by Beijing's incentives. Credit: REUTERS/Grace Liang

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A model poses next to a GM EN-V, or Electric Networked-Vehicle concept car at the Beijing Auto Show, April 23, 2010. Credit: REUTERS/Jason Lee

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A model poses at the Beijing Auto Show, April 23, 2010. Credit: REUTERS/Jason Lee

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A Ferrari F60 Formula One car is displayed at the Beijing Auto Show, April 23, 2010. Credit: REUTERS/Grace Liang

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A model poses next to a Geely Englon TXN car at the Beijing Auto Show, April 23, 2010. Credit: REUTERS/Jason Lee

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BYD Chairman and President Wang Chuanfu gestures near a new BYD S6 car at the Beijing Auto Show, April 23, 2010. Credit: REUTERS/Jason Lee

Chief

Chief Executive of German luxury carmaker BMW Norbert Reithofer walks out of a BMW Vislovl car at the Beijing Auto Show, April 23, 2010. Credit: REUTERS/Grace Liang

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A model poses next to a Chana EV-concept electric car at the Beijing Auto Show, April 23, 2010. Credit: REUTERS/Jason Lee

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A new Citroen revolte car is displayed at the Beijing Auto Show, April 23, 2010. Credit: REUTERS/Jason Lee

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A staff member speaks next to a Ford Eco Boost car at the Beijing Auto Show in Beijing, April 23, 2010. Credit: REUTERS/Grace Liang

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A model poses next to a new Jeep Wrangler made by Chrysler Group at the Beijing Auto Show in Beijing, April 23, 2010. Credit: REUTERS/Grace Liang

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A new Mercedes-Benz SLS AMG car is displayed at the Beijing Auto Show in Beijing, April 23, 2010. Credit: REUTERS/Jason Lee

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A new Infiniti Essence concept car is displayed at the Beijing Auto Show, April 23, 2010. Credit: REUTERS/Jason Lee

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A new Volvo S60 car is displayed at the Beijing Auto Show in Beijing, April 23, 2010. Credit: REUTERS/Grace Liang

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A model poses near a new Intelligent Geely (IG) hybrid car at the Beijing Auto Show, April 23, 2010. Credit: REUTERS/Jason Lee

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A model poses behind the new Mercedes-Benz SLS AMG at the Mercedes-Benz Car Luxury and Leadership Evening ahead of the Beijing Auto Show, April 22, 2010. Credit: REUTERS/Jason Lee

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A staff member walks out of the new generation Maybach car during its world premiere ceremony ahead of the Beijing Auto Show, April 22, 2010. Credit: REUTERS/Jason Lee