1. Wind Loads. For the purpose of design, wind pressure shall be taken upon the gross area of the vertical projection of all billboards and billboard structures at not less than twenty pounds per square foot. In calculating wind pressure on curved surfaces such as cylindrical or spherical billboards or billboard structures, this pressure shall be assumed to act on six-tenths of the projected area. In all billboards the area used in computing wind pressure shall be one and one-half times the net area of the framing members exposed to the wind.

2. Seismic Loads. In areas of high-intensity shock, all billboard structures shall be designed in accordance with local requirements to resist earthquake shock. Wind loads and seismic loads need not be combined in the design of billboard structures. Only that loading producing the larger stresses need be used.

3. Allowable Stresses. The design of wood, concrete or steel members shall conform to the requirements of the latest edition of the Uniform Building Code as adopted by the city. Loads, both vertical and horizontal, exerted on the soil shall not produce stresses exceeding those therein specified. The working stresses of wire rope and its fastenings shall not exceed twenty-five percent of the ultimate strength of the rope or fasteners. Working stresses for wind or seismic loads combined with dead-loads may be increased as specified in the Uniform Building Code.

1. Restrictions on Combustible Materials. Billboards and billboard structures may be constructed of any material meeting the requirements of this chapter, except as provided in this section. Billboards and billboard structures erected within five feet of an exterior wall in which there are openings within the area of the sign shall be constructed of noncombustible material or approved plastics.

2. Nonstructural Trim. Nonstructural trim may be of wood, metal, approved plastics or any combination thereof.

3. Fastenings. Billboards and billboard structures attached to masonry, concrete or steel shall be safely and securely fastened thereto by means of metal anchors, bolts or approved expansion screws of sufficient size and anchorage to support safely the loads applied.

1. The light from any illuminated billboard or billboard structure or from any light source shall be so shielded or directed that the light intensity or brightness shall not adversely affect surrounding or facing premises nor adversely affect safe vision of operators or vehicles moving on public or private roads, highways or parking areas. Light shall not shine or reflect on or into residential structures.

2. No billboard or billboard structure shall have blinking, flashing or fluttering lights or illuminating devices which have a changing light intensity, brightness or color or which are so constructed and operated as to create an appearance or illusion of writing or printing. There shall not be flashing of all elements simultaneously or any flashing which could be construed as a traffic control device. Revolving beacons are prohibited.

3. No billboard or billboard structure shall be animated or rotate nor shall any animated or rotating parts be used; provided, however, that animated devices giving only the date, time or temperature are permitted.

4. No exposed reflective type bulbs and no strobe lights or incandescent lamps which exceed fifteen watts shall be used on the exterior surface of any billboard or billboard structure so as to expose the face of the bulb, light or lamp to any public street or adjacent property. No reflector for the purpose of intensifying the brightness of the light shall be permitted.

1. Billboard structures and billboards shall be set back at least two hundred feet from any residentially zoned property. No billboard or billboard structure shall be placed within five hundred feet of any park, playground, church, or school.

2. There shall be a minimum distance of one thousand feet of linear separation, measured parallel to the street corridor, between any two billboard structures or billboards on the same side of the street. Those billboards or billboard structures for which a permit was first issued shall be used to establish the initial point from which minimum distances shall be measured.

3. No billboard or billboard structure shall be erected or maintained within four hundred feet of linear separation, measured parallel to the street corridor of another billboard or billboard structure located on the opposite side of a street or highway, unless the billboard or billboard structure is in conformance with Section 16.20.070.

4. Billboards and billboard structures shall not be erected or maintained in such a manner as to obscure or otherwise physically interfere with an official traffic sign, signal or device or to obstruct or physically interfere with the driver’s view of approaching, merging or intersection traffic. All corner lots on which billboards and billboard structures are erected or maintained shall form a triangular area, one angle of which shall be formed by the front and side lot lines, and the sides of such triangle forming the corner angle shall be one hundred feet in length measured from the aforementioned angle. The third side of the triangle shall be a straight line connecting the last two mentioned points, which are a distance of one hundred feet from the intersection of the front and side lot line, and within the area comprising the triangle, no billboard or billboard structure shall be erected or maintained.

5. No billboard or billboard structures shall be located on or project over any public property or city right-of-way.

6. No billboard or billboard structure shall be erected or maintained in a location which results in the removal of any city code required landscaping or parking.

7. No billboard structure shall be erected within ten feet of any right-of-way unless the billboard structure contains only one vertical support, in which case there shall be at least a five-foot setback from the right-of-way. In no case shall any portion of a billboard or billboard structure project within five feet of the right-of-way in the case of a monopole structure or within ten feet in the case of all other structures.

8. No billboard or billboard structure shall be located on or attached to any building.

9. No billboard or billboard structure shall be erected in such a manner that any portion of its surface or supports will interfere in any way with the free use of any fire escape, exit or standpipe.