# Level Crossing (Trummery) Order (Northern Ireland) 2004, Paragraph 11


When the ‘lower’ push-button is pressed or the train occupies a track circuit, the sequence of events to close the crossing to road traffic shall begin. The sequence shall be:
(a) the amber lights shall immediately show and the audible warning shall begin. The lights shall show for approximately 3 seconds;
(b) immediately the amber lights are extinguished the intermittent red lights shall show;
(c) 4 to 6 seconds later the left-hand side barriers shall begin to descend and shall take a further 6 to 10 seconds to reach the lowered position;
(d) the right-hand side barriers shall then begin to descend taking 6 to 10 seconds to reach the lowered position;
(e) the audible warning shall stop when all the barriers are fully lowered.

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Source: https://www.legislation.gov.uk/nisr/2004/244/schedule/2/paragraph/11 (the official version)
Page: https://openlegislation.uk/level-crossing-trummery-order-northern-ireland-2004/schedule-2/paragraph-11
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.