Bought this at the flea market this morning. The seller didn't know what is was from, and there were a couple of us trying to decide as well. Everyone agreed that it looked like it would've been a highway sign. The yellow paint is reflective like a highway sign. But looking online, I can't find another one like it. It does have some age to it, and it is heavy (not aluminum like the new signs). From the wear on the back of it, it was obviously mounted to a pole/post of some sort. Meaures 30" by 24". Anyone have any idea if this is a highway sign or what it might be from?