A 'Hospital' sign is a warning for what?

The 'Hospital' sign serves as an important warning to drivers that emergency vehicles, such as ambulances, may be frequently present in the area. This sign is crucial for alerting drivers to the potential need to yield or make way for these vehicles, as they often respond to urgent situations and require swift passage. Recognizing the presence of a hospital signals that drivers should remain vigilant and prepared to adjust their driving behavior to facilitate the movement of emergency services, ensuring public safety and efficient emergency response.

In this context, the other choices do not accurately reflect the primary purpose of the 'Hospital' sign. While general health and safety tips, increased traffic volume, and rest areas are all relevant to road conditions, they do not pertain specifically to emergency vehicle activity associated with hospitals.