Tesla’s Autopilot partially automated system can keep a car centred in its lane, keep a distance from cars in front of it, and can even change lanes on its own with a driver’s consent. But Tesla has said the driver must be ready to intervene at all times. Tesla Model Y automatically steered along painted lane lines without acknowledging that nobody was at the controls. The test came just days after a Tesla crashed in Texas, killing the two men in the car . How safe can it be when driving without a driver on the highways ?