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Learn the history of how florescent five sided yellow-green signs became the official sign template for school zone warning signs. Read more at CPC Signs. Fluorescent Yellow-Green Signs The color most important to know, by far, is Fluorescent Yellow-Green, also known as FYG to traffic sign manufacturers. The specially engineered color is reserved among all traffic signs to alert drivers to school zones. It’s not the yellow with an orange tint that you see on more general warning signs, such as railroad crossings, no-passing zones, or to indicate an impending merge. It’s not the yellow you see on a school bus, either—that’s known as National School Bus Glossy Yellow. FYG is an entirely different hue. The History of a Color School warning signs are Fluorescent Yellow-Green to ensure they are never mistaken for something else. The neon-like yellow materials weren’t durable enough for long-term signage until the early 1990s. FYG...

How Does Retroreflectivity Work? Retroreflectivity is the word for when traffic signs shine light from headlights back at the driver, allowing them to read any signs effectively at night or in low-light conditions. A seemingly clear layer on each sign contains prisms and beads that allow the light to reflect back to the source. The reflective layer is not clear, however. Reflective layers are made to match the color of your standard safety sign. There...