For years, ever since they were pulled by horses, in fact, if you wanted a cab you stood on a street and hailed the driver. And that's still the way it works in many places. But there's a new kid in town. Uber.
It allows customers to use a mobile phone app to get hold of the nearest cab. Uber are often cheaper, but not everyone's happy - not least the drivers of the regular taxis themselves.
And now, the battle that has been fought in cities around the world is heading to Brighton.
Andy Dickenson reports. He speaks to Andy Peters from the GNB, John Streeter of Streamline Taxis, and Jason Kitcat of Crunch accounting.
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