(1) The trap points or derailing switches are single switched rail points provided on a line to isolate it from another lines. The switch is so designed that a vehicle passing over it shall derail if it is in open position. The station master shall take steps that the points of all traps or derailing switches, and other points are set against the line which they are intended to isolate, except when it is necessary that they should be open for the purpose of isolation.
(2) All trap points or derailing switches on running lines shall be proved and inter locked with signals.
(3) (a) non interlocked trap points or derailing switches shall be provided with a trap indicator displaying a red target by day and a red light by night in each direction when open; and
(b) when the trap points or derailing switches are closed, the trap indicator shall display no target by day and green light by night in each direction.