Schedule 4 of the Dangerous Substances in Harbour Areas Regulations (Northern Ireland) SR 1991/509 sets out the format of flag indicating a vessel is carrying a dangerous substance.

PART 1

SHAPE AND COLOUR OF FLAG

The shape of the flag must be as shown in the diagram below.

 The flag must be red in colour.

PART 2

MATERIAL AND SIZE OF FLAG ON VESSELS WITH A MAST

The flag must be made of fabric.

The side of the flag marked "a" on the diagram shown...

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