What term describes the structure with two openings that controls movement and creates a secure area between openings?

What term describes the structure with two openings that controls movement and creates a secure area between openings?

• A. Perimeter fence
• B. Sally port
• C. Two-gate system
• D. Vehicle checkpoint

Answer: (B)

A sally port is a controlled entry that uses two doors to create a secure buffer area between the outside and inside. The key idea is that only one door can be opened at a time, so staff can verify credentials, inspect items, and hold someone or something in the space between the doors before allowing passage. This setup helps prevent unauthorized entry and tailgating, and it often supports monitoring with cameras or access controls. Perimeter fence is just the outer boundary with no controlled two-door passage. A two-gate system describes a similar concept but isn’t the standard term for the built structure. A vehicle checkpoint focuses on vehicles passing through rather than a two-door, human-access control with an interstitial space.

A sally port is a controlled entry that uses two doors to create a secure buffer area between the outside and inside. The key idea is that only one door can be opened at a time, so staff can verify credentials, inspect items, and hold someone or something in the space between the doors before allowing passage. This setup helps prevent unauthorized entry and tailgating, and it often supports monitoring with cameras or access controls.

Perimeter fence is just the outer boundary with no controlled two-door passage. A two-gate system describes a similar concept but isn’t the standard term for the built structure. A vehicle checkpoint focuses on vehicles passing through rather than a two-door, human-access control with an interstitial space.