What is the purpose of a warning sign?

The purpose of a warning sign is to alert drivers to potential hazards ahead, allowing them to take appropriate action to ensure safety. These signs are designed to convey information about upcoming conditions that might require drivers to slow down, exercise caution, or be prepared for changes in road situations. For example, a warning sign might indicate a sharp turn, a steep hill, or pedestrian crossings, all of which can pose risks if not heeded.

By effectively communicating potential dangers, warning signs play an essential role in preventing accidents and promoting safe driving habits. The other options—encouraging speeding, indicating a school zone, and informing drivers of traffic rules—do not accurately capture the primary function of a warning sign, which is centered around hazard awareness.