A group of tech wizards in an office in San Francisco will bring London's traffic to a total standstill this week, using nothing more than an iPhone app.
It sounds like the sort of unlikely computer-hacking scenario dreamt up by a Hollywood studio, but tomorrow it will become reality as thousands of furious black cab drivers blockade the capital in protest against Uber, the American taxi-hailing app, which they say is driving them out of existence.
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Up to 10,000 licenced cab drivers are due to stage a drive-slow through the centre of the city, beginning at Trafalgar Square, before lining up their vehicles across key roads and bringing all traffic to a stop. For Londoners who have slowly grown accustomed to Tube strikes, it will be a novel new form of transport chaos - but it is also a vivid illustration of how rapidly an established industry can find itself outpaced by technology.
Uber, which was founded in 2009 and has its headquarters in San Francisco, allows users to locate and book nearby taxis with their smartphones. It has built up a vast number of cars very quickly by allowing anyone with a Private Hire Vehicle licence to sign up as a driver.