But there is more to this story than Tesla's self-driving software making mistakes. Tesla and boss Elon Musk say Autopilot can only be used on motorways, where multiple lanes mean there are markers on the road at both sides of the car, which it uses to operate the steering. The system also requires drivers to lightly touch the steering wheel at all times, preferably with the fingertips of their upturned hands resting on their legs. Drivers are told to only use Autopilot on motorways (or freeways in the US), and to touch the wheel at all times, every time they switch the feature on.