Stopping Tailgating at Secured Entrances

A badge reader controls who can open a door, not how many people walk through it. At a busy lobby or a side entrance near the parking garage, one valid credential can admit two, three or a dozen people. Tailgating is rarely malicious, but it quietly breaks the assumption that every person inside was authorized, and it leaves the security team with no record of who actually entered.

The problem

Most enterprise sites see tailgating in a few predictable places: main lobbies at shift change, employee entrances near parking, loading areas and interior doors to sensitive spaces such as labs or network rooms. The usual responses each have limits:

• Guards can watch a lobby, but not every door, and not around the clock without significant cost.
• Turnstiles stop most piggybacking at the front door, but they are not practical at every entrance, and determined people can still jump or double up.
• Door held and door forced alarms from the access control system flood the GSOC with events that say little about what actually happened.

The result is often a choice between friction for employees and a blind spot for the security team.

The approach

An integrated approach layers physical control, identity and video so that each layer covers the gaps in the others, and all of it lands in the platform operators already use.

Physical control where it fits

Optical turnstiles or speed gates at main lobbies enforce one person per credential and give a clear signal when someone attempts to pass without one. At secondary doors where turnstiles are not practical, the design relies more on detection than on a physical barrier.

Faster, stronger identity

Facial authentication readers, such as those from Alcatraz, let enrolled employees pass without presenting a badge and confirm that the person at the reader is the credential holder. Some of these readers can also count people in the reader's view and raise an event when more than one person passes on a single authorization.

Video analytics as the second set of eyes

AI video analytics, such as Ambient.ai, watch existing camera streams for tailgating, turnstile jumping and doors propped open. Because the analytics can read access events from the access control platform, they can compare what the camera sees with what the reader granted, and automatically clear door alarms that turn out to be harmless.

One operator workflow

Alerts from turnstiles, readers and analytics are written into the existing access control or VMS platform (for example, Genetec Security Center) as alarms with the associated video clip. Operators verify the event, decide on a response and close it out in a single console, rather than watching a separate application.

What it takes to get right

• Design by entrance. Each entrance gets a profile based on traffic, risk and building constraints. Turnstiles in the lobby, facial authentication at high-traffic employee doors and analytics on the doors that remain.
• Camera placement. Analytics need a clear view of the threshold and the approach. Existing cameras are assessed first, and new or relocated cameras are added only where coverage is poor.
• Integration and tuning. Event mapping, alarm priorities and analytics thresholds are tuned with real traffic across day, swing and night shifts before alerts go to the GSOC.
• Privacy review. Facial authentication processes biometric data and is opt-in for most programs, with enrollment, retention and deletion policies defined in advance. Behavior-based analytics typically detect actions, not identities. Biometric privacy laws vary by jurisdiction, so we recommend involving your privacy team and legal counsel before deployment.
• Testing. Acceptance includes scripted tailgating and jump scenarios, and blind tests run by the GSOC where possible.
• Third-party work. Turnstile installation often involves flooring, electrical and fire alarm interfaces. Electrical, low-voltage cabling and network work are typically handled by the customer's trades and IT unless IoTHS is contracted for them, and the responsibility split is set out in the scope.

Where it fits

This approach suits corporate campuses, headquarters lobbies, data center entrances and any site where badge sharing or tailgating is a known audit finding. A short pilot on a few entrances is a practical way to measure fit before a wider rollout.

Next step

Talk with us about the entrances that concern you most. Contact us to plan an assessment or pilot, or read more about access control solutions.