During the state driving test, signals are required when:

Signals are a crucial part of safe driving and communication on the road. During the state driving test, it is essential to use signals when other vehicles are present to indicate your intentions, such as turning, changing lanes, or stopping. Using signals helps to alert other drivers and pedestrians about your next move, allowing them to react appropriately and ensuring everyone's safety.

While it's true that signaling at intersections is important, it is not limited to just those locations. Additionally, signaling when there are no vehicles around may seem unnecessary, but it's a good habit to maintain regardless of the traffic situation. Therefore, correctly signaling when other vehicles are present showcases the understanding of road safety and effective communication between drivers, which is why this is the correct answer.