When the car is in autonomous mode, the human does not contribute in any way to the driving.
There are two philosophies that are driving research and development in autonomous driving: series autonomy and parallel autonomy. Parallel autonomy concerns developing driver-assist technologies where the driver is at the wheel, but the driver-assist system monitors what the driver does and intervenes as needed—in a way that does no harm—for example to prevent a collision or to correct the steering angle that keeps the car on the road. The autonomy capabilities of the car grow incrementally but operate in parallel with the human. The parallel autonomy approach allows the car to operate anywhere, anytime. Series autonomy pursues the idea that the human or the car are in charge, but not both. When the car is in autonomous mode, the human does not contribute in any way to the driving. The car’s autonomy capabilities also grow incrementally, but this car can only operate according to the capabilities supported by its autonomy package. The car will gradually operate in increasingly more complex environments.