Yellow Pencils

Stuart and I have been wondering about the purpose of the strange giant yellow pencils that have been springing up around the streets of Manchester.

Thanks to google, the mystery is solved, our schools link guess was correct.

Of course, given that word as to their purpose doesn't exactly seem to have spread like wild-fire, there could be a slight down-side in motorists taking their eyes off the road to ponder "look at that strange giant pencil, I wonder what that's all about...".

So consider this public service announcement or something...