# Level Crossing (Poyntzpass) Order (Northern Ireland) 1997, Paragraph 6


The audible alarm shall sound if—
(a) any barrier is horizontally dislocated when in the fully lowered position;
(b) the main power supply fails;
(c) both the intermittent red lights of any of the road traffic signals fail.

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Source: https://www.legislation.gov.uk/nisr/1997/68/schedule/2/paragraph/6 (the official version)
Page: https://openlegislation.uk/level-crossing-poyntzpass-order-northern-ireland-1997/schedule-2/paragraph-6
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.