China's first autonomous bus line debuts By TAN YINGZI and DENG RUI in Chongqing | China Daily | Updated: 2021-04-16 09:10 Share Passengers board an autonomous bus in Chongqing. [Photo by WANG QUANCHAO/XINHUA] China's first autonomous bus line started commercial operations in Yongchuan district of Chongqing on Monday with passengers boarding a red Baidu Robobus bus for city trips. "I did not expect the bus to run so smoothly. There was no shaking or any sudden braking," a middle-aged woman passenger told Chongqing Morning Post. "The seats are very comfortable and I will certainly take the bus again." Robobus, developed by Chinese tech giant Baidu, is a Level-4 autonomous driving bus. It is 5.9 meters long and can carry 19 passengers at a cruise speed of 40 to 60 kilometers per hour. Level-4 autonomy means that the vehicle can drive autonomously in most conditions without a human driver.