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Tesla robot cars have an autopilot feature which means the car can drive itself better than a human can.

Doctor Eric Horvitz is the Managing Director of Research at Microsoft's main lab in the States.

Explaining how he uses the car, Horvitz told 5 live he "came down 15 miles without touching the steering wheel", and that it was "beautiful to watch the power even of today's technology outside of the laboratory available to us now".

This clip is originally from 5 live Phil Williams on Monday 4th January 2016