What is the main purpose of warning signs related to intersections?

The main purpose of warning signs related to intersections is to inform drivers of potential hazards ahead. These signs are crucial for alerting drivers to situations that may require caution, such as upcoming intersections where vehicles might be crossing their path, pedestrians could be present, or where the road geometry changes. By effectively communicating these imminent risks, warning signs help drivers anticipate the need to adjust their speed or position, ultimately promoting safer driving practices and preventing accidents.

While the other options relate to important traffic control measures, they do not encapsulate the primary role of warning signs. Some signs may instruct drivers on stopping or indicate speed limits, but these functions are specific to regulatory signs rather than warning signs. Similarly, signs marking the start of a new road fall under directional or guide signs, rather than the alerting purpose of warning signs in the context of intersections.