What'll they think of next? Cardboard Kids.
I recall somewhere in my travels you topped a small hill on I-?? in the state of ?? and there was the silhouette of a state police car sitting sideways in the median about a 1/2 mile away. All you saw was dozens of brake lights from the others who'd just topped the hill in front of you.
In fact, you yourself stepped on the brakes to slow it down a bit. But no ticket tiday. It was a full size plywood cutout painted in the correct colors. But you didn't realize it until you got almost on top of it.
True story, honest. It might have been I-70 in Indiana or maybe Missouri, I can't really be for sure.