Which of the following best describes the purpose of warning signs?

Warning signs are crucial in helping drivers anticipate and react to potential hazards on the road. They serve to alert you about conditions or situations that may not be immediately visible, such as curves, intersections, or changes in road conditions. By indicating the presence of hazard areas ahead, warning signs provide essential information that promotes safe driving and prepares drivers to respond appropriately.

In contrast, the other options serve different functions in traffic management. Providing information on speed limits is the role of regulatory signs, not warning signs. Directing traffic flow is typically a function of guide signs or signal systems, which manage how vehicles and pedestrians navigate the roadways. Similarly, signaling the end of controlled areas relates to regulatory signs that convey specific rules or conditions rather than indicating hazards. Thus, warning signs specifically focus on alerting drivers to potential dangers ahead, making option B the best description of their purpose.