The signs are all over the place. Some might consider them as unpleasant as the bags of dog s***.
Comic Sans again.
There's another - I hope less likely - possibility. It may be someone sleeping in a vehicle.
Several years ago we had a problem in one of the streets near Tottenham Hale station. Truck drivers were sleeping in their cabs - presumably to save money on overnight accommodation. They left their refuse - including faeces - in plastic bags under the truck, and then drove off leaving the street cleaner to clear it up.
(Tottenham Hale ward councillor)
I suppose that's one step up from just chucking it out of the window unwrapped.
Whoever did the signs, better to add a photo with a strike-through and a picture of arrows to a landfill dustbin - allowing for non-english / non-readers.
I like it!