Geetarism/Getty Images Drivers today can face a veritable rainbow of traffic signs, and each color has its own particular meaning. In fact, we've already checked out why some stop signs are blue, why school zone signs are fluorescent yellow-green, and even the significance of the rarely-seen pink road sign. Well, today our color wheel turns to orange. That distinctive hue is reserved for temporary traffic control (TTC) warning signs. As evident from the name, orange is meant to indicate that the warnings are only for relatively short-term, temporary situations, while yellow is for more general, permanent warnings, such as sharp corners. The color of traffic zone signs in this country is governed by Chapter 6F of the Manual on Uniform Traffic Control Devices (MUTCD), which is currently in its 11th edition. And under Section 6H.01 Warning Sign Function, Design, and Application, it says that — with very few exceptions — "TTC warning signs shall be diamond-shaped with a black legend and border on an orange background." As examples of those exceptions, the Grade Crossing Advance Warning sign must be black on yellow, and school zones with fluorescent yellow-green signage can use that same color for their construction-zone warning signs, too. That said, the MUTCD has a total of 13 color standards reserved for traffic control signs, which we'll cover below. What does orange mean in a work zone? Sergii_Petruk/Shutterstock But first, there's also some color theory behind the choice. Orange is a vibrant color that's proven to easily grab attention, and that makes it ideal for quickly warning about the potential dangers of a construction zone — to both drivers and workers. Consider: It can take drivers well over a second to recognize and respond to expected changes in driving conditions, on average. This may not sound like a lot, even with a half-second reaction time at 60 mph, your car would have traveled 44 feet before you react. So, it's unsurprising to discover that orange was among the very first colors assigned to traffic scenarios, starting with the fifth edition of the MUTCD that was published in 1971 (the first edition was published in 1935). You might have also noticed that it's not only the signs in work zones that are orange. Look around, and you'll see that color is found on safety vests, traffic cones, traffic barrels, and other barricades. This is intentional, and the idea is to create a single work-zone ecosystem in which drivers know to be extra careful of their surroundings. What colors are reserved for traffic signs? Zargondesign/Getty Images Keep in mind that, even though 13 colors are mentioned in the guide, only 11 have currently been assigned specific meanings. Coral and light blue are on the list in case someone comes up with new traffic scenarios that need them. The other colors and their uses are itemized in Section 1D.05, and note that the MUTCD has officially approved fluorescent alternatives for red, yellow, green, and orange: Black — regulation (signs referring to traffic laws/regulations) Blue — road-user services guidance, tourist information, and evacuation route Brown — recreational and cultural-interest area guidance Fluorescent Pink — incident management Fluorescent Yellow-Green — pedestrian warning, bicycle warning, playground warning, school bus warning, and school warning Green — indicated movements or actions permitted and direction guidance Orange — temporary traffic control Purple — restricted to use only by vehicles with registered electronic toll collection (ETC) accounts Red — stop or prohibition White — regulation Yellow — warning
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