# Level Crossing (Trummery) Order (Northern Ireland) 2004, Paragraph 9


Visual indicators and an audible alarm shall be provided at the control point. The indicators shall show when:
(a) the main power supply is available;
(b) all the barriers are fully raised;
(c) all the barriers are fully lowered;
(d) at least one of the intermittent red lights of the traffic light signals on each side of the railway is showing along the carriageway.

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Source: https://www.legislation.gov.uk/nisr/2004/244/schedule/2/paragraph/9 (the official version)
Page: https://openlegislation.uk/level-crossing-trummery-order-northern-ireland-2004/schedule-2/paragraph-9
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.