Why Are Highway Signs Green? A Highway Expert Breaks It Down

Reader's Digest By Marcy Lovitch

Oct. 27, 2025

Green highway signs are everywhere, but why are they green?

When you’re driving down the highway, you naturally pay attention to traffic signs. But do you ever think about why they look the way they do or why they’re a certain color? Take the green ones. Green highway signs, also called guide signs, are everywhere, and we pass them by without much thought. But their design has a big role in getting us where we need to go safely.

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