A minibus decorated with All Nippon Airways Co.'s signature blue and white logo motors across the tarmac at Tokyo's Haneda airport. From the outside, it looks like an ordinary bus, with a person sitting in the driver's seat — except no one is really operating the vehicle.

Reporters got a glimpse Tuesday of an autonomous airport bus experiment in progress. It is part of Japan's first series of experiments on automatic vehicle-control systems designed to carry passengers within an airport's restricted zone.

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