What kind of sign warns you of the highest safe speed for a turn ahead?

The advisory speed sign is specifically designed to inform drivers of the recommended safe speed for navigating a turn or curve ahead. This type of sign often utilizes a combination of a symbol and numerical speed limit to guide drivers to slow down or adjust their speed to enhance safety as they approach a potentially hazardous situation, such as a sharp bend in the road. The advisory speed sign is particularly important in situations where the curvature of the road may not be immediately visible, alerting drivers to adjust their speed accordingly to maintain control of their vehicle.

In contrast, a stop sign indicates that drivers must come to a complete stop before proceeding, a regulatory speed limit sign establishes the maximum legal speed allowed on a roadway, and a no U-turn sign restricts drivers from making a U-turn at that location. None of these signs provide specific guidance related to safe speeds for turns, which makes the advisory speed sign the most relevant choice for this situation.