What road sign warns you of a hidden intersection?

The warning sign indicating a hidden intersection is typically represented by a diamond shape with a cautionary symbol. This design is used to alert drivers to potential dangers ahead, specifically the possibility of vehicles or pedestrians approaching from an intersecting road that may not be easily visible. The diamond shape is universally recognized as a sign that notifies drivers to slow down and exercise caution, as visibility may be obstructed.

In contrast, a circular red sign generally signifies a stop or yield situation, which is not specific to hidden intersections, while rectangular blue signs provide information or guidance rather than warnings about potential hazards. The triangular yield sign indicates a need to yield the right of way but does not specifically warn of hidden intersections. Therefore, the diamond-shaped sign with a warning symbol is the most appropriate indication of a hidden intersection scenario, where drivers should approach with increased awareness.