I Love U

I Saw this whilst walking across a bridge on the way back from the shops. I took a few others but I thought this one was the most interesting. Plus I wonder why someone did it. Could have an interesting story behind it.

Edit: found this http://www.chroniclelive.co.uk/north-east-news/evening-chronicle-news/2009/01/08/hunt-on-for-byker-romeo-who-left-love-message-72703-22646234/