A secured door only works when every person passing through it has been verified. That is the core issue behind tailgating vs piggybacking. In both situations, someone enters a controlled business area without completing the required access process.
Tailgating usually happens when an unauthorized person follows an approved user through a secured entrance without that user intentionally granting access. Piggybacking generally involves an authorized person knowingly letting another individual enter with them.
The distinction matters because each behavior takes advantage of a different weakness. Tailgating commonly relies on door timing, crowded entrances, or poor traffic control. Piggybacking is more likely to exploit courtesy, trust, pressure, or social engineering.
For businesses, the priority is ensuring one approved credential does not automatically grant entry to two people.
Tailgating is unauthorized entry gained by closely following someone who has legitimate access to a protected area.
For example, an employee presents a badge at a controlled office entrance. The reader accepts the credential and unlocks the door. Before it closes, another person slips through without presenting a badge.
Tailgating can occur at employee entrances, office suites, warehouses, loading areas, parking access points, server rooms, storage areas, and other restricted spaces.
Piggybacking generally occurs when an authorized person knowingly allows someone else to enter a secured area without completing the normal verification process.
The request may sound harmless:
“I forgot my badge.”
“I have a delivery.”
“My card isn’t working.”
“I’m here to repair the network.”
Instead of directing that person to reception or another verification point, the employee holds the door open.
That is why a piggybacking attack is closely connected with social engineering.
Tailgating-vs-piggybacking in to a commercial workspace
The main difference in tailgating vs piggybacking is usually how much the authorized person participates in the unauthorized entry.
Security Issue
Tailgating
Piggybacking
How entry happens
Someone follows an authorized user through a controlled entrance.
An authorized user lets another person enter.
Employee involvement
Usually unaware of the unauthorized entry.
Knows the second person is entering.
Typical example
Someone slips through before the door closes.
An employee holds the secured door open.
Weakness exploited
Traffic flow, timing or doorway control.
Trust, courtesy or social engineering.
Main prevention focus
Entry controls, monitoring and detection.
Verification, access policy and training.
These incidents frequently take advantage of everyday workplace habits rather than sophisticated attack techniques.
Busy Entrances
Morning arrivals, lunch periods, meetings, and shift changes can place many people at one access point. An unfamiliar individual may move through with the group before anyone notices.
Employees Holding Doors
Holding a door is normally polite. At an access-controlled entrance, however, it can bypass the process the business installed to verify each user.
Employee or Contractor Impersonation
Someone may claim to be an employee who forgot a badge, a technician completing a repair, or a delivery worker who needs to get inside.
Tools, packages, work clothing, or a confident explanation can make the story look legitimate.
Shared Credentials
When several people use the same card, fob, or PIN, the access record becomes less useful because the business cannot reliably determine who actually entered.
Propped Doors
A reader cannot control access through a doorway intentionally left open during deliveries, maintenance, cleaning, or employee breaks.
Old Access Permissions
Former employees, temporary workers, or contractors may retain access after they no longer have a business reason to enter. Permissions should change when employment, assignments, or vendor relationships change.
Strong tailgating prevention combines technology, access policies, entrance design, and employee behavior.
Every person entering a controlled area should use their own approved credential.
Cards, fobs, PINs, mobile credentials, and other identifiers should not be shared.
A clear one-person, one-credential, one-entry policy improves accountability and makes access records more useful when an incident needs to be reviewed.
Not every employee needs permission to enter every room.
Commercial access control can restrict entry according to:
User
Department
Door
Floor
Work schedule
Restricted area
Temporary access period
An employee may need the main office entrance but have no business reason to enter the server room, inventory cage, or records area.
Limiting permissions reduces unnecessary access inside the property.
Employees should not have to decide at a secured doorway if an unfamiliar person belongs inside.
Visitors, delivery personnel, contractors, and vendors should follow a defined process for check-in and verification.
Temporary credentials can also be limited by time and location. A contractor working on one floor for one day should not receive unrestricted building access.
Access records and video answer different questions.
Access control tells you which credential was accepted. Video surveillance helps show what happened around the entrance.
When both systems work together, security teams can determine if:
One person entered
Multiple people crossed the doorway
Someone waited near the entrance
Suspicious activity occurred around an access event
Video coverage is particularly useful at employee entrances, loading areas, restricted interior doors, storage areas, and after-hours access points.
Some locations require tighter traffic control than a standard secured door.
Businesses may consider:
Turnstiles
Controlled access vestibules
Mantrap-style entry
One-person-at-a-time entrance controls
Other anti-tailgating systems
These measures can be useful around data rooms, financial operations, high-value storage, critical equipment, or other sensitive areas.
That does not mean every doorway requires the same controls. Security should match the actual risk of the location.
A card or fob may provide enough authentication at a normal employee entrance, while a higher-risk room may require an additional factor.
Depending on the facility, businesses may use:
PINs
Mobile credentials
Biometric authentication
Credential combinations
The purpose is not to make every entrance difficult to use. Stronger authentication should be applied where unauthorized access would have a greater impact.
An access-control system can provide useful information beyond simply locking and unlocking doors.
Businesses can monitor events such as:
Door forced open
Door held open too long
Repeated denied access
After-hours entry
Unexpected activity at restricted doors
Connecting these events with surveillance, intrusion detection, or professional monitoring can provide additional context when something requires attention.
Physical access should be part of employee and contractor offboarding.
Remove or update permissions when:
An employee leaves
An employee changes roles
A contractor finishes a project
A temporary assignment ends
A badge is lost
A vendor no longer requires access
Temporary credentials should expire automatically when possible instead of remaining active indefinitely.
Technology cannot fix piggybacking if employees routinely bypass the access procedure.
Staff should know exactly what to do when someone says:
“I forgot my badge.”
“I’m making a delivery.”
“I’m here for maintenance.”
Instead of making the decision themselves, employees should direct the person to reception, security, a facility manager, or another approved verification point.
The rule is clear:
Courtesy should not replace authorization.
Employees can remain helpful without opening a secured area to an unverified person.
Tailgating in workspace
No. Security cameras alone cannot prevent tailgating.
Cameras provide visibility and evidence. They can help show how many people crossed an entrance, support investigations, and give security personnel more information when suspicious activity occurs.
However, a camera does not determine who has permission to enter, nor does it physically restrict passage through an open door.
Different security layers perform different jobs:
Access control determines authorization.
Credentials identify approved users.
Video surveillance provides visual context.
Physical entrance controls regulate passage.
Intrusion detection identifies defined security events.
Monitoring supports response.
Employee procedures reduce human error.
The strongest approach connects these functions instead of expecting one technology to handle every problem.
Access control is central to preventing unauthorized entry, but a standard card reader alone cannot guarantee that only one person passes through after a door unlocks.
A successful credential tells the system:
This user has permission to open this door.
It does not necessarily tell the system:
Only this user entered.
Higher-risk entrances may therefore require additional door monitoring, video verification, controlled vestibules, turnstiles, visitor controls, or other anti-tailgating measures.
Any organization with restricted areas can face tailgating, but some properties require tighter controls because of their traffic, assets, or sensitive spaces.
These may include:
Corporate offices with busy employee entrances.
Warehouses with employees, drivers, vendors, and temporary workers.
Data centers protecting servers and critical infrastructure.
Healthcare facilities with staff-only and records areas.
Manufacturing facilities with production and equipment zones.
Financial organizations protecting sensitive operations.
Multi-tenant properties separating public and tenant areas.
Facilities receiving frequent contractors or deliveries.
Security requirements should be based on building design, visitor activity, operating hours, traffic flow, and the impact unauthorized entry could have on each area.
Tailgating prevention works better when security systems are designed around how people actually enter and move through a property.