driverless
adjective uk/ˈdraɪ.və.ləs/ us/ˈdraɪ.vɚ.ləs/
（车辆）无人驾驶的
(of a vehicle) not having a person as a driver
Driverless cars could possibly help ease traffic congestion, lower pollution, and prevent accidents. 无人驾驶汽车可能有助于缓解交通堵塞，降低污染，防止事故。