# Motor Vehicles (Construction and Use) Regulations (Northern Ireland) 1999, Paragraph 9


(1) The articulated vehicle must have a maximum of at least 6 axles.
(2) The laden weight of the articulated vehicle must not exceed the weight determined in accordance with sub-paragraph (3).
(3) The weight for the purposes of sub-paragraph (2) is the number of kilograms equal to the product of the distance measured in metres between the king-pin and the centre of the rearmost axle of the semi-trailer multiplied by 5500 and rounded up to the nearest 10 kg, if that number is less than 44,000 kg.

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Source: https://www.legislation.gov.uk/nisr/1999/454/schedule/14/paragraph/9 (the official version)
Page: https://openlegislation.uk/motor-vehicles-construction-and-use-regulations-northern-ireland-1999/schedule-14/paragraph-9
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.