What type of port should be used upon arrival at the destination?

A sally port is specifically designed for secure entry and exit in situations that require a high level of control over access, often used in law enforcement and correctional facilities. The design of a sally port typically involves two sets of doors or gates that cannot be opened simultaneously, providing a buffer zone that minimizes the risk of escape or unauthorized entry. This controlled environment is crucial when transporting detainees, ensuring their safety and the safety of staff and the public.

In contrast, the other types of entrances mentioned—public entrances, side entrances, and main entrances—often do not have the same level of security and control as a sally port. Public and main entrances may be designed for access by the general public and can be more vulnerable to unauthorized access. Side entrances may also be less secure and are not specifically tailored for the requirements of handling inmates and securing the area effectively. Thus, when arriving at a destination where security is paramount, utilizing a sally port is essential to maintain control and safety.