What is anti-tailgating in gate access?

• A. Anti-tailgating makes the gate travel faster during peak hours.
• B. Anti-tailgating eliminates the need for any credential verification.
• C. Anti-tailgating prevents one user from gaining unauthorized access by following; implemented using sensors, hold-open time control, and controlled exit devices.
• D. Anti-tailgating uses only cameras for security.

Answer: (C)

Anti-tailgating is a security measure that prevents someone from gaining access by following closely behind an authorized user. It relies on detection and control: sensors monitor the entry area to spot more than one person attempting to pass on a single credential, hold-open time control keeps the opening from staying open long enough for others to slip through, and controlled exit devices ensure exits are monitored so a second person can’t piggyback in. In practice, you present a credential and the gate opens for one person; if a second person tries to follow, the system can trigger an alert or deny entry. Cameras alone aren’t enough, and simply speeding up the gate or removing credential verification wouldn’t provide real protection.