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An employee drives a Tesla Motors Inc. Model S electric automobile, equipped with Autopilot hardware and software, hands-free on a highway in Amsterdam, Netherlands, on Monday, Oct. 26, 2015. Tesla started equipping the Model S with hardware -- radar, a forward-looking camera, 12 long-range sensors, GPS -- to enable the autopilot features about a year ago. Photographer: Jasper Juinen/Bloomberg via Getty Images

An employee drives a Tesla Motors Inc. Model S electric automobile, equipped with Autopilot hardware and software, hands-free on a highway in Amsterdam, Netherlands, on Monday, Oct. 26, 2015. Tesla started equipping the Model S with hardware -- radar, a forward-looking camera, 12 long-range sensors, GPS -- to enable the autopilot features about a year ago. Photographer: Jasper Juinen/Bloomberg via Getty Images