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A picture made available on 23 September 2015 shows a Chinese taxi driver putting up the “for hire” sign in his taxi outside a train station in Beijing, China, 17 September 2015. With almost 20 million cars sold last year, China is the largest passenger cars market in the world and chronic traffic congestions in many of its cities like Beijing is one of the reasons why taxi and car hailing smartphone apps offered by Didi Kuaidi and Uber Technologies Inc. are widely popular with commuters. (Photo by How Hwee Young/EPA)
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