The annual massive migration in China has began. As usual, hundreds of millions of Chinese are traveling home for the upcoming Spring Festival. And they will travel back to their working cities after the official seven-day vacation. It is estimated that more than 3 billion journeys will be made this time.

Baidu Maps rolled out a site that tracks moves of Chinese people in the past eight days. It’s based on the location data from apps that use Baidu Maps APIs. On Baidu’s platform there are more than 400,000 developers and more than 100,000 apps that cover 500 million mobile phone users, according to Baidu.

Tracey Xiang is Beijing, China-based tech writer. Reach her at

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