# Level Crossing (Trummery) Order (Northern Ireland) 2004, Paragraph 21


Protecting railway signals shall be provided and these shall be interlocked with the barriers so that it shall not be possible, other than by hand, to raise the barriers from their positions across the carriageway unless the protecting railway signals are set at Danger and whilst the barriers are raised it shall not be possible to clear those signals.

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Source: https://www.legislation.gov.uk/nisr/2004/244/schedule/1/paragraph/21 (the official version)
Page: https://openlegislation.uk/level-crossing-trummery-order-northern-ireland-2004/schedule-1/paragraph-21
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.