A Level 4 (L4) self-driving Changan Automobile takes a driving drill in a pilot zone for 5G-based autonomous driving in Southwest China's Chongqing municipality, July 26, 2019. The pilot zone equipped with Level 4 (L4) self-driving capabilities was launched in Chongqing on Thursday. [Photo by Liu Chan/Xinhua]

Photo taken on July 25, 2019 shows a sensor on a Level 4 (L4) self-driving Changan Automobile in a pilot zone for 5G-based autonomous driving in Southwest China's Chongqing municipality. The pilot zone equipped with Level 4 (L4) self-driving capabilities was launched in Chongqing on Thursday. [Photo by Liu Chan/Xinhua]

Aerial photo taken on July 25, 2019 shows a Level 4 (L4) self-driving Changan Automobile taking a driving test in a pilot zone for 5G-based autonomous driving in Southwest China's Chongqing municipality. The pilot zone equipped with Level 4 (L4) self-driving capabilities was launched in Chongqing on Thursday. [Photo by Liu Chan/Xinhua]