Section 37(3) in The Bangalore Metro Railway (General) Rules, 2011
(3)Obstruction detection -(a)Sensors are provided to detect any person trapped between train door and Platform Screen door at station with curved platform, when all platform screen doors and platform edge doors are closed by the train operator, the sensors shall check and give following indications on Platform Screen door local panel at both headwall and tailwall:(i)nobody trapped - Green; and(ii)somebody trapped - Red flashing,unless sensors detect all doors clear, Platform Screen door system will not give clearance for train departure;(b)in case of detection of an obstruction in between two Platform Screen door leaves of a Platform Screen door resulting in non closure of such door, the door makes three attempts to close automatically, if the obstacle is removed in these attempts Platform Screen door closes again, if obstacle is still present, then the Platform Screen door stops in unlocked position and is free to be pushed back by hand and once the obstruction disappears, train driver can open and close the doors again and if the problem persists, then, station staff shall attend the affected door.
