Autopilot is in the early stages of development but the company has fitted it in cars to let drivers try out the feature.
Tesla recommends drivers keep their hands on the wheel at all times while the car drives. The system will slow down the car if the driver’s hands are off the wheel.
The lorry driver has claimed Brown was watching a Harry Potter film at the time of the crash, but Tesla said films cannot be watched on its in-car TV system.