What does a triangular road sign with a red border typically signify?

A triangular road sign with a red border serves as a warning indicator to drivers about potential hazards or changes in road conditions ahead. This type of sign is designed to alert drivers to situations that may require additional caution, such as sharp turns, pedestrian crossings, or other dangers that could affect the safety of their driving experience. The red border emphasizes the importance of the warning, making it clear that drivers should be vigilant and prepared to respond appropriately to the indicated hazard.

In contrast, the other options represent different types of traffic control signals: speed limit signs provide instructions on how fast one can legally drive; mandatory lane change signs direct drivers to alter their path under specific conditions; and parking prohibition signs indicate areas where parking is not allowed. Each of these has its own unique shape and color coding to convey its specific message, which distinguishes them from the triangular warning signs.