# The Dangerous Substances in Harbour Areas Regulations 1987, Paragraph 4


Hazard warning signs to be affixed to hazard warning panels and labels for compartmented tank barges shall, for any part of the sign that is not black have a black border–
(a) in the case of signs for hazard warning panels, at least 2 millimetres wide;
(b) in the case of signs for labels, at least 1 millimetre wide.

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Source: https://www.legislation.gov.uk/uksi/1987/37/schedule/1/paragraph/4 (the official version)
Page: https://openlegislation.uk/dangerous-substances-in-harbour-areas-regulations-1987/schedule-1/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.