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![]() Vehicles move forward slowly on a main road during evening rush hour in Sao Paulo, Brazil, Dec 21, 2010. The city had 6.95 million vehicles registered by November 2010, which includes about 5 million minivans. During rush hour, cars sitting in traffic can extend as long as 50 kilometers, causing a loss of 4 billion reals ($2.35 billion) annually. [Photo/Xinhua] |