Unmanned bus route on glass bridge in Zhangjiajie

An unmanned bus, weighing 5.5 tons, test runs on a 430-meter-long and 6-meter-wide glass bridge hanging between two steep cliffs 300 meters above the ground in Zhangjiajie, a famous tourist destination in Central China's Hunan province, on April 24, 2019. The test run shows the first unmanned bus route in a scenic area across the country can soon be in operation. [Photo/chinanews.com]