It is in the shape of a shield.
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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.
true
8 sided like a stop sign
Hexagon
Stop sign is a regular octagon in the US It depends on which country you are in