What does a yellow diamond-shaped sign indicate?

A yellow diamond-shaped sign serves as a warning of potential hazards ahead, making this the correct choice. These signs are designed to alert drivers to various conditions that may require caution, such as upcoming curves, pedestrian crossings, or changing road surfaces. The bright color and diamond shape are specifically chosen to catch the driver’s attention and convey important safety information quickly.

In contrast, other types of signs have different shapes and colors to communicate different messages. For instance, speed limit signs are typically rectangular and posted to inform drivers of the maximum safe speed. Construction zone signs usually have an orange background to signal work areas ahead, while signs indicating a stop ahead might be octagonal or another shape specific to stopping regulations. Thus, understanding these distinctions helps ensure that drivers can recognize and respond appropriately to road signs, ultimately promoting safe driving practices.