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A prohibitive sign is designed to convey restrictions or prohibitions for road users. The color of these signs is typically red or a combination of red and white, which universally signals that certain actions are not allowed. For instance, a sign indicating "No U-Turn" directly communicates that making a U-turn is prohibited in that area, ensuring safety and proper traffic flow. This clear indication serves to prevent drivers from performing maneuvers that could lead to accidents or congestion.

In contrast, the other options refer to different types of signs. Signs that encourage specific actions or behaviors are often green or blue, while changes in traffic patterns might be communicated through yellow caution signs or other colors like orange for construction zones. Speed limits are designated by signs that often incorporate black lettering on a white background. Understanding the specific purpose of prohibitive signs is crucial for maintaining safety and compliance on the road.