They also point up the explosion of sponsored roundabout art that has been taking place over the last decade or so - barely a circular traffic facility survives unadorned by some striking image, figurative or symbolic, inspiring or playful.

BBC: Sheep on Shoreham roundabout

"For example if someone says Swedish people are literally born on skis, they are using figurative language in born on skis, but using literally is conjuring up an image of midwives delivering babies on skis - we laugh because it's a juxtaposition, " he says.

BBC: Why is 'literally' such a troublesome word?