Specifications include, but are not limited to: The retroreflective sheeting shall conform to the design, colors and sheeting type as approved by the Commonwealth of Kentucky. The sheeting must have a minimum shelf life of 1 year when proper stored. The specifications contained herein shall apply to all standard size plates and are inclusive of all special category plates issued by the Commonwealth of Kentucky for which retroreflective sheeting shall be requested. The retroreflective license plate sheeting will be laminated to a specified aluminum substrate that is then embossed and processed with roller coating inks to enhance legibility of the vehicle identification and it must remain highly reflective when viewed at a wide variety of entrance angles. When using white background sheeting all graphic inks shall be transparent to facilitate the same daytime/nighttime appearances. The retroreflective sheeting shall be designed for multi-year reflective license plates. It shall consist of lens elements enclosed within a transparent resin. The sheeting shall have a precoated, pressure sensitive adhesive backing protected by a removable liner. The preprinted design in the reflective sheeting shall be buried below the sheeting surface and be protected to insure reliable long-term durability. The coefficient of retro-reflection for the sheeting shall be measured on flat, clean, finished license plate test panels and shall have the following minimum values at 0.2 observation angle, expressed as candlepower per foot-candle per square foot (candelas per lux per square meter) of material. Measurements shall be conducted in accordance with ASTM E810, Standard Test Method for Coefficient of Retroreflection of Retroreflective Sheeting. or its equivalent. Measurements on reflective sheeting with a preprinted graphic design shall be taken in an unprinted sheeting area
