No intoxicating liquor, as defined in this chapter, shall be drunk, consumed or publicly exhibited in a public dining room, lunch room, soda fountain or any place where meals or lunches and soft drinks are served, where the owner or manager exhibits on the premises signs or placards to the effect that intoxicating liquor may not be drunk in or about the premises. Such signs or placards shall be of sufficient size and in sufficient number to be easily discernible to the general public.

(Code 1964, § 4.300)