In scenarios of potential collision, what is the controller's main responsibility?

The primary responsibility of a controller in scenarios of potential collision is to issue safety alerts. This action serves to inform pilots of the imminent threat and allow them to take immediate action to avoid a collision. Issuing a safety alert is crucial, as it helps to ensure that pilots are aware of any potential conflicts with other aircraft. The alert can prompt pilots to change their altitude or course, thus enhancing the overall safety of airborne operations.

By issuing safety alerts promptly and clearly, controllers play a critical role in maintaining safe separation between aircraft. This step is essential in both preventing accidents and managing situations where planes are on a converging path. While other actions, such as maintaining communication or altering flight plans, may also be relevant in some contexts, the immediate response required in potential collision scenarios is primarily focused on alerting pilots to the danger.