What is a Sally Port/Trap?

• A. A single gate with an electric lock
• B. Two gate systems on a common roadway that provide two control points
• C. A barrier gate at a toll plaza
• D. A pedestrian turnstile at a facility entrance

Answer: (B)

A Sally Port is a two-gate entry system that creates a small secure chamber between doors, giving two separate control points for entry or exit. This setup allows verification and prevents tailgating or unauthorized access because a person or vehicle cannot pass through both gates at once—the first gate must be secured, then the second gate opens only after the area is confirmed safe. That two-gate vestibule is the defining feature, often with interlocks and sometimes alarms, to manage security and staging between outside access and the secured area. The option describing two gates on a common roadway with two control points matches this concept exactly. The other scenarios describe single-gate access or different devices that don’t provide the two-control-point trap structure.