What does a yellow diamond-shaped sign indicate?

A yellow diamond-shaped sign is universally recognized as a warning sign indicating potential hazards or conditions that drivers should be aware of on the road. These signs can advise drivers of various warnings, such as curves, intersections, or pedestrian crossings, prompting them to exercise caution and adjust their driving accordingly. The purpose of these signs is to alert drivers to situations that may not be immediately visible, allowing them to prepare for changes in the road or driving conditions.

In contrast, while a yellow sign could sometimes relate to construction, those typically have a specific orange color. Speed limit signs are usually rectangular and display the allowed speed, and information about nearby services—such as gas stations or rest stops—would appear on blue square or rectangular signs. Thus, the diamond shape and its yellow color are specifically designated for warning of possible hazards ahead.