I live in a pretty rural area, and something like this (but worse) happened on my road.
A cat got hit by a car and laid decomposing in the middle of the road. The road crew simply painted the double yellow line over the cat. It was there for quite a while, and got pretty bad with bloato-moto. Everytime you drove past, it would wave at you with its one arm proudly up in the air.
Having worked with various road crews in varying capacities I would put my money on the side of this being real and not photo shop. Shoddy work from a lazy son of a.... And yes, so sad.
I have seen a dead opossum with road stripes painted over it in Oregon, and have since found a picture of a similar event in a newspaper. This is not uncommon.