What do three-sided triangle-shaped signs (with red trim) indicate?

The three-sided triangle-shaped signs with red trim indicate a warning of danger ahead. This shape is universally recognized as signaling to drivers that there is a potential hazard or a specific caution they need to be aware of on the road. For instance, these signs are often used to warn about upcoming intersections, sharp curves, or the presence of pedestrians. The red trim signifies the need for alertness, emphasizing the importance of paying attention to the warning being provided.

In contrast, other types of signs serve different functions: regulatory signs enforce laws and regulations, prohibition signs specifically indicate actions that are not allowed, and informational signs typically provide helpful details or guidance rather than warning of hazards. Understanding the function of these triangle-shaped signs is crucial for safe driving, as they prompt drivers to proceed with caution and prepare for potential dangers ahead.