Q. What does the word "retroreflective" mean?
A. "Retroflective" means the ability of a material to return light to its source. In order to appear bright to drivers at night, signs need to be either directly illuminated or have "retroflective" surfaces so that the light striking them from vehicle headlights is reflected back to the driver's eyes.
Q. How is a sign made retroreflective?
A. To make a sign retroreflective, special material called "reflective sheeting" is used. This sheeting consists of a white or colored material having a smooth, sealed outer surface incorporating miniature glass beads or uniform microprismatic lenses over its entire surface.
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