A driverless car (also called autonomous car or self-driving car, i.e. self-operating) is a vehicle that can perform certain tasks on its own, without the help of a human driver. . The car uses sensors to analyze its environment, and doesn't need a a human's help for certain tasks These tasks commoly include parking the car, driving while keeping the same lane on a highway or driving at a predefined speed. In public places, certain buses have been programmed to travel a given route. As of 2021, self-driving cars have been used in controlled envirnoments more and more. An example of this might be buses that transfer passengers between airport terminals. 