Another unknown is whether Israel would dare to strike Iran without a green or at least an amber light from the Americans.

ECONOMIST: Be very afraid, please

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

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

The brewery runs free daily tours (except Sunday) including tastings of their golden, light, amber and dark ales.

BBC: The Holy Land of beer

I. security clearances, did the world-altering work of civil seraphim, and strode endless hallways, cracking wise in pools of amber light.

NEWYORKER: State of the Union