Japan has been a late adopter when it comes to smartphones, but it's catching up quickly - already more than half the population owns one. But Tokyo is a crowded city, and warnings are being issued about the risk of mass collisions among phone-using pedestrians at one busy crossing.

It's 5pm on a Friday and I'm standing in a coffee shop above Shibuya crossing - one of the most famous intersections in the world.

It's a place where every two minutes, more than a thousand of Tokyo's smartly dressed commuters and fashion-making teens gather at eight points, ready to cross - then rush straight for each other.

It looks like they must crash, this sea of people, but they swerve and swing around each other, like dancers pirouetting, and they all get to the other side safely.

It's awe-inspiring, so much so that at times it leads people - including myself - to say rather trite things about how it's the perfect symbol of Japanese society: the many individuals acting together for the greater good.

But the reason I'm here, isn't to gawp in amazement, it's in the hope that I'll see people crash.

I want businessmen ploughing into each other, their umbrellas flying off their arms, and immaculately uniformed schoolchildren tripping up grannies.

Why may I get to see this now, when I wouldn't have had the chance even a year ago? It's very simple - smartphones.

Smartphone use is booming in Japan. In 2017, only about a quarter of Japanese used them, most being perfectly happy with their everyday mobiles.

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