What type of structure is typically used to prevent unauthorized access in public buildings?

Access control is a critical component in safeguarding public buildings and is designed to regulate who can enter a facility and under what circumstances. This system encompasses various methods and technologies that can prevent unauthorized access, such as keycard systems, biometric scanners, or security personnel. By implementing an access control system, organizations can monitor entry points, maintain security logs, and enforce policies regarding who is permitted to access certain areas based on their clearance level or identity.

While barriers, fences, and gates may contribute to overall security by creating physical boundaries and restricting entry, they do not inherently control access in the same comprehensive manner as an access control system. Barriers and fences can deter entry but lack the capability to assess and authorize individuals trying to gain access. Gates can provide a means to control who can enter an area, but without a structured access control process (like a system that verifies identities or security status), they may not be enough to ensure security. Therefore, access control stands out as the most effective and systematic approach to preventing unauthorized access in public buildings.