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Computer simulation shows 1,500 people walking while using a mobile device

The Japanese mobile carrier NTT Docomo has been producing a series of public service announcements cautioning people that using a smartphone while walking isn't a good idea. The latest video shows what happens when 1,500 people all do it at once. At one of the busiest intersections in Japan.

That's Shibuya crossing in Tokyo, a five-points intersection that permits "scramble crossing," which is everyone may cross in any direction, all at once. Assuming everyone tried to navigate this intersection while gazing down at a smartphone, NTT Docomo presents this madhouse scenario with help from Aichi University.

The moral of the story: Don't text and walk. And don't text and drive either.

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