Update - the day after I took the photo down below, it rained. Absolutely poured down. The posters that had been taken off this pole and dumped on the ground turned into a sodden mass, and when I went past a bit later in the day, they were halfway towards the drains.
Someone - council perhaps? - has been through here and ripped all the posters off this traffic light post. However, instead of taking them away, they've left them on the footpath.
How long before they either blow around the streets, or wash into a drain and end up either in a water way or on a beach?
I wish the people who stuck these things up would think about what happens next.