Car-following refers to another person, whether an employee or not, passing through a security door without the knowledge of a person who has obtained a legal passage through a security door. This is a similar concept when you follow your car on the highway without your permission. You are being followed.
A piggyback is when another person enters through the door while gaining access. If someone hugs you or actually carries you, this is called "strapping." Only 2 techniques can distinguish between 2 people and 1 person. Human and 3D machine vision systems.
There are various ways to prevent trailing and slinging through a secure door. At mission-critical locations, armed guards 24 hours a day, 7 days a week, cost a lot. An alternative to armed guards can be to install a three-dimensional machine vision system that can distinguish between people and objects. This is a mature technology that has been used for decades in factory automation and robotics. Newton Security's patented T-DAR technology is the world's most reliable system for detecting and preventing trailing through safety gates.
The two types of entrances in the anti-tailing system are a single door and two doors in a set of secure spaces called mantrap.
The single-door anti-tailing system has the ability to sound and alert to warn security personnel of unauthorized intrusions. Since there is only one door, this cannot be a trap for people.
Mantrap is a secure space with 2 or more doors. When one person enters the mantrap area, the T-DAR 3-D machine vision system performs a dynamic scan confirming that only one person is in the space. If another person enters the space, they will be detected and there will be 2 people alerting in the space. The door on the space safety side is locked so no one can enter the space. Both people must exit mantrap before entering the process.
This is a very good mantrap demo in the game: http://www.youtube.com/watch? v = gYw0rskVHTU
Orignal From: What is the difference between a safety gate and a tailgate controlled by an access control?
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