# The Carriage of Dangerous Goods by Road and Rail (Classification, Packaging and Labelling) Regulations 1994, Paragraph 3


Subsidiary hazard signs 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 as depicted in column 2 of Part I of this Schedule delineates the edge of that sign and need not be shown.)

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Source: https://www.legislation.gov.uk/uksi/1994/669/schedule/2/paragraph/3 (the official version)
Page: https://openlegislation.uk/carriage-of-dangerous-goods-by-road-and-rail-classification-packaging-and-labelling-regulations-1994/schedule-2/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.