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Drones used to monitor traffic during May Day holiday in S 皇冠体育app

(Xinhua) Updated: 2016-05-03 08:51

Drones used to monitor traffic during May Day holiday in S 皇冠体育app

A traffic police controls a drone to patrol for highway conditions in Guangzhou, South 皇冠体育app's Guangdong province, May 2, 2016.[Photo/Xinhua]

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