Red is used exclusively for regulatory road signs prohibiting doing something. So, a stop sign is red because you are prohibited from driving past it without stopping. “Yield,” “do not enter,” no left ...

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Q: Traveling east on Highway 520, approximately a half-mile from the West Lake Sammamish Parkway exit, an overhead yellow sign reads “Exit.” But if one moves to the lane, where the sign is posted over ...

Imagine you’re driving down West Avenue in Miami Beach when you come upon a highlighter-yellow traffic sign in a crosswalk. The sign is waist-high and rectangular — about a foot wide and three feet ...