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.
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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.
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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.