YAVAPAI COUNTY PLANNING AND ZONING ORDINANCE Page 162 contained within the most recent Manual on Uniform Traffic Control Devices – MUTCD, U.S. Department of Transportation Federal Highway Administration. (MUTCD – Recommended Minimum Letter Heights on Street Name Signs.) (a) Length of sign shall not exceed forty-tow inches (42”). (b) Sign blade shall be six inches (6”) wide, extruded aluminum with a .090 web thickness and a .250 flange thickness for intersecting streets of speeds 30 mile per hour (mph) or less. Such signs shall have minimum letter heights of four inches (4”) for the street name and three inches (3”) for the suffix designation and directional prefixes, if used. (c) Sign blade shall be nine inches (9”) wide, extruded aluminum with a .090 web thickness and a .250 flange thickness for intersecting streets of speeds 35 mile per hour (mph) or greater. Such signs shall have minimum letter heights of six inches (6”) for the street name and four inches (4”) for the suffix designation and directional prefixes, if used. (d) Sign letters shall be reflectorized. (e) Private street name signs shall have a brown background with white high-intensity reflective lettering. County maintained roadway signs shall be contrasting colors and shall have a white message on a green background. (f) Conventional abbreviations are acceptable EXCEPT for the street names itself. (g) Letters used shall be either heat activated 3M#2290 or equivalent or pressure activated 3M#3290 or equivalent. Normally a type “C” letter should be used. However, a type “B” letter may be used if necessary, to fit the name on the sign. (h) Sign backing material shall be engineer’s grade 3M#2277 or equivalent. (i) Sign posts, foundations, and mountings shall be constructed as to hold signs in a proper and permanent position, and to resist swaying in the wind or displacement by vandalism. Break away posts are recommended in case of signpost damage. (j) Signs shall be vertically mounted at right angles to the direction of and facing the traffic they are intended to serve. Signs shall be placed atop of existing posts or stop signs when available. (k) It will be the responsibility of the property owners to keep the sign properly positioned, clean, and legible with adequate reflectivity. Damaged or deteriorated signs shall be replaced as soon as possible by the property owners, or no later than fourteen (14) days after notification by the Addressing Official. (l) All signs placed on public road right-of-way shall be approved by the County Engineer or his appointed representative.