Mercedes-Benz USA has a testimonial video from a Google executive who was one of the first American customers to avoid a real-life collision because his car stopped without him even noticing the car ahead.

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It appeared impossible for Mr Evans, from Tiverton, to avoid a virtual head-on collision said the prosecutor.

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But the first officer, still believing that the object in the sky above him was the cargo plane, initiated a dive to avoid the perceived imminent collision -- sending the jetliner toward the Air Force plane.

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He said the demo version could only self-park in an area equipped with sensors and restricted to other robotic cars to avoid the risk of collision.

BBC: Nissan car drives and parks itself at Ceatec