every now & then I see the "legal" looking signs in places I suspect might not be authorized for use... meaning, someone had a sign made up & slapped it where it's at to annoy peds.
If I were to support the state/fed to use technology, it would be to put QR codes on all legally issued signs that have a location designation for anyone to have the ability to scan it & check it for legitimacy.
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-Oh Hey!