An interstate sign could be classified by polygon if allowed, since it has more than 3 sides, but since they are not equal, an interstate sign is technically not a polygon. If you ask an expert this same question, they would probably say "no". Hope this helps.
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Yes. An octagon is a polygon.
It is in the shape of a shield.
An eight-sided polygon, like a stop sign is an octagon.
by making stop sign
There are several state and county roads with that number, and there's Interstate 81.