Schedule 3 of the Dangerous Substances in Harbour Areas Regulations (Northern Ireland) SR 1991/509 sets out the dangerous substances which, when being transported, require the vessel to display certain flags and lights.

The dangerous substances are:

• more than 25 tonnes of sodium chlorate or potassium chlorate or more than 500 tonnes of ammonium nitrate of Class 5.1;
• bulk liquefied gases of Class 2, including the remnants of such gases which, remain after their discharge from a tank which has not subsequently been gas-freed or inerted;
• bulk liquids of Class 3 with a flashpoint, when determined in accordance with the appropriate approved...

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