Flap barrier is a good solution for pedestrian access control requirement. Passage
in one or both directions electronically controlled. On receiving a signal from
the access control system, or remote control, the arms open(Normally Closed
NC.)If an unauthorized person tries to tailgate or attempts to enter from the
opposite direction, the in-built alarm system is activated. if within the pre-set
timeout no passage has occurred, the lane will close and reset.