A driverless bus stops on the street in Tallinn, capital of Estonia, Aug. 8, 2017. Two driverless buses Tuesday attracted various passengers for a free ride after more than a week's service on the limited central Tallinn route in live traffic. The shuttles are being introduced as part of Estonia's EU presidency from July to December, with one of the priorities being the development of technology and its impact on society. (Xinhua/Guo Chunju)
