On site signs which are necessary for public convenience or safety but which are nonexempt, may be approved by the planning commission. Signs containing information such as "Open", "Closed", "No Vacancy", "Vacancy", "Entrance", "Exit" and directional arrows, but not business or product identification, shall be designed to be viewed from on site, or from an area adjacent to the site, by pedestrians or by motorists. Such signs shall not exceed four (4) square feet in area. (Ord. 440, Series of 2010)