Thursday 13 December 2012 7.38am
I too am mystified by this. Do people put them on to deliberately dazzle other people, which doesn't work in the fog.
I have another question. Why, when the Shard is often covered in fog, was it crystal clear when I cycled up Union Street
yesterday, when it was actually foggy. People approaching from other angles said it was covered in fog, but I could see right to the top.