# The Dangerous Substances in Harbour Areas Regulations 1987, Paragraph 3


Hazard warning signs to be affixed to a freight container, portable tank or receptacle shall have a line of the same colour as the symbol, 5 millimetres inside the edge and running parallel to it. (The broken line which surrounds each sign delineates the edge of that sign and need not be shown.)

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Source: https://www.legislation.gov.uk/uksi/1987/37/schedule/1/paragraph/3 (the official version)
Page: https://openlegislation.uk/dangerous-substances-in-harbour-areas-regulations-1987/schedule-1/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.