Last year, he announced plans to classify the performance of English hospital trusts using a simple traffic-light system of green, amber and red.

ECONOMIST: Hospitals

But correspondents say it was the measure to stop driving through red and amber lights that went down badly with motorists.

BBC: Busy road in Beijing (file image)

It now allows users to explore their personal style through an expanded collection of new colors that take their inspiration from nature: Amber Brown, Garnet Red, Sapphire Black and Titanium Grey.

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It said it wanted a "traffic light" warning system for drugs - with green for those safe to take and drive, amber for caution and red signalling severe adverse effects which would dangerously impair driving.

BBC: You are in: UK

You will have your own favourites, but I always liked the Traffic Light Tree in London's Docklands, a bewildering display of red, amber and green which kept me waiting, transfixed and tense, for really quite some time when I first encountered it.

BBC: Sheep on Shoreham roundabout