Which category of alerts prohibits embarking or disembarking passengers without a bridge?

The category of alerts that prohibits embarking or disembarking passengers without a bridge is the Red Alert. This alert is characterized by heightened security risks or safety concerns that necessitate strict access control and passenger movement regulations. During a Red Alert, all ground operations are closely monitored, and certain procedures are put in place to ensure the safety of passengers and personnel on the airside of the airport.

By restricting passenger movement to designated areas with a bridge, the response to potential threats is more manageable, and it minimizes the risk of incidents occurring. This policy plays a crucial role in ensuring that all procedures follow regulatory requirements and that the safety of individuals is prioritized above all else.