# The Level Crossing (Castlerock) Order (Northern Ireland) 2016, Paragraph 4


When the barriers are fully lowered, their uppermost surfaces shall be not less than 900mm above the road surface at the centre of the carriageway and the under-clearance between the barriers and the road surface shall not exceed 1 metre.

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Source: https://www.legislation.gov.uk/nisr/2016/403/schedule/1/paragraph/4 (the official version)
Page: https://openlegislation.uk/level-crossing-castlerock-order-northern-ireland-2016/schedule-1/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.