ABSTRACT
Contents Introduction .............................................................................................................................201 Mantraps ................................................................................................................................ 202 Turnstiles ................................................................................................................................ 202
Optical Turnstiles .......................................................................................................... 204 Revolving Doors ............................................................................................................ 205 Traditional Turnstiles .................................................................................................... 205
Conclusion .............................................................................................................................. 206
Introduction Th e challenge with most card systems is tailgating. Th is is when one person unlocks a door using a security credential and three people walk into a secured room. Depending on the criticality of the secured space, this may not be acceptable.
