What feature activates an audible and visual alarm regarding the ladder's movement?

The rotation interlock serves a crucial safety role in the operation of a fire truck's aerial ladder by activating both audible and visual alarms whenever the ladder is in motion. This feature is designed to alert personnel on the scene and those operating the vehicle that the ladder is being deployed or moved, enhancing awareness and safety during operations.

When the ladder is rotated or extended, the rotation interlock ensures that the system is monitored, preventing accidents that could occur from unintended movement while personnel are at work. The sound and light alarms effectively communicate the ladder's status, prompting others to maintain a safe distance or take appropriate precautions.

Understanding the purpose of the rotation interlock reinforces the importance of situational awareness and safety protocols in fire operations. The other features listed, such as sirens or outrigger warning lights, serve different functions, like alerting traffic or indicating the stability of the vehicle but do not directly relate to the movement of the ladder itself.