What is the purpose of regulatory signs?

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Regulatory signs communicate rules that drivers must follow. They establish legal obligations or restrictions on traffic, such as speed limits, required stops or yields, and permitted or prohibited movements. Because these signs reflect enforceable laws, failing to comply can result in penalties like fines or points on a driving record.

Think of examples like speed limit signs, stop signs, yield signs, no left turns, and no parking zones. These are not just suggestions—they define what you are legally allowed or not allowed to do in specific places or situations.

The other options don’t fit because weather warnings are shown by signs or advisories that alert you to conditions you should prepare for, not rules you must follow. Scenic-value signs provide information about points of interest, not traffic regulations. Advertising on traffic signs is not permitted, as signs must convey official traffic laws or restrictions, not commercial messages.