Which type of radio traffic includes requests for service or incident arrival information?

The correct response relates to emergency traffic as it encompasses urgent communications that are essential for responding to incidents. This type of radio traffic is used to relay critical information, including requests for service and updates about the arrival of emergency personnel at the scene.

Emergency traffic is prioritized because it directly pertains to life-safety situations where prompt coordination and response are necessary. This ensures that all team members and relevant agencies are immediately aware of the status of an incident, which is crucial for effective management and response efforts.

In contrast, routine traffic covers non-urgent communications that do not require immediate attention, while clearance traffic generally pertains to the formal documentation of an incident's closure or clearance from an active status. Verification traffic is not a commonly recognized term in this context, adding further distinction to why emergency traffic is the correct choice.