By the looks of the photos, none of the street signs are normal parking zone signs, but rather special event signage. Those are only used for special events an

By the looks of the photos, none of the street signs are normal parking zone signs, but rather special event signage. Those are only used for special events and don't change very often. This is a good example for their use. I agree with what others have said about the risks and concerns if this were to be used for ALL parking signs.