The "Emergency traffic" radio callout is primarily used to signal what need?

The "Emergency traffic" radio callout is primarily used to signal an immediate need to clear the radio frequency for urgent communications. This situation typically arises when there is a life-threatening emergency or critical incident requiring immediate attention from all units on the scene. By declaring "Emergency traffic," personnel are alerting all responders that they must stop non-essential communications to ensure that critical information can be transmitted without delay or interference. The need for prioritizing important safety communications is paramount in emergency situations, making this callout crucial for effective incident management and ensuring the safety of personnel involved in the response.