Probably the recent poster asking questions about how to make aluminum house number signs, yet he apparently already knew everything there was to know...
Thought he could save some money by making Coroplast stop signs, rather than aluminum! "Score!", he thought. "Those idiots are wasting money on aluminum, and nobody will even notice my secret trick."
But seriously, aren't sign shops contracted with state and federal entities to make road signage? Curious how this ended up happening and which sign shop thought this would be a good idea.