An autonomous driving system (ADS) is a technology that allows a vehicle to drive itself without the need for a human driver. ADSs use sensors and computers to navigate, making them much more accurate and reliable than human drivers. Most ADSs are still in development, but there are already a few commercially-available systems on the market. Tesla's Autopilot, for example, is an ADS that can be added to certain Tesla vehicles. It uses radar, cameras, and GPS to automatically steer, change lanes, and park the car.