A robotic bike park
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Inside a robotic cycle park

Spencer Kelly goes underground to see a robotic bike park in action below Tokyo's streets.

Tokyo has many cyclists but limited space for parking bicycles on the city's crowded streets and pavements.

The solution is to park your bike underground. Spencer Kelly goes behind the scenes to see how an underground robotic bike park works.

Watch more clips on the Click website. If you are in the UK you can watch the whole programme on BBC iPlayer.