China is already the world's largest market for car sales. The popularity is apparent on the streets, where traffic can be atrocious.
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Drivers check for a better view during "Car Free Day" in Beijing.
More people live in China than any other country, and in 2010 it surpassed the United States as the largest car market on Earth. As the popularity of automobiles grows, China's infrastructure has struggled to keep pace.
The result is -- like anywhere else in the world -- traffic jams.
Yet traffic jams in China are not always brief hiccups during the evening commute. In fact, the worst jams in China, while rare, can last for days.
By Charles Riley@CRrileyCNN - Last updated October 07 2012 10:14 PM ET