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a. Warning sign
Warning sign is a sign that has the nature of a warning to do something. Such as billboards for orderly traffic.
b. Lighting sign
An information sign is a bill of information in the form of a notice to the general public. Such as information billions about health.
c. Call or solicitation billboards
Call or request advertisements are advertisements that invite or ask the public to follow an appeal. Such as blood donor billboards.
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