# The Road Vehicles (Construction and Use) (Amendment) (No.5) Regulations 1988, Regulation 4: Amendments of regulation 79


Regulation 79 shall be amended as follows —
(a) in paragraph (3), for “paragraph (5)” there shall be substituted “paragraphs (5) and (6)”.
(b) in paragraph (4), for “paragraph (5)” there shall be substituted “paragraphs (5) and (6)”.
(c) after paragraph (5), there shall be added the following paragraphs —
“(6) Nothing in paragraphs (3) or (4) shall apply so as to prevent a semi-trailer being used on a road if —
(a) it is a semi-trailer to which this paragraph applies; and
(b) the weight transmitted to the road surface by all the wheels of any axle of the semi-trailer does not exceed the relevant weight.
(7) Paragraph (6) applies to a semi-trailer if —
(a) it has a total of three axles;
(b) the outermost axles are spaced at a distance apart of at least 0.7m but not more than 3.25m, such distances being obtained as provided in regulation 3(10);
(c) each axle is fitted with suspension devices in which air springs are used to support a substantial part of the weight borne on that axle; and
(d) the devices are so interconnected and maintained that under any relevant condition of load the weight transmitted to the road surface by all the wheels of any one axle does not exceed the total weight transmitted to the road surface by all the wheels of any other axle by more than 500 kg.
(8) For the purposes of paragraphs (6) and (7), in relation to a semi-trailer any two adjoining axles of which are spaced at such a distance apart as is specified in an item in column 2 of Part VI of Schedule 11 —
(a) “air spring” means a spring operated by means of air or other compressible fluid under pressure;
(b) “relevant condition of load” means a condition of load which causes the weight transmitted to the road surface by all the wheels of any one axle to exceed the weight shown in column 3 of that item;
(c) “relevant weight” means the weight shown in column 4 of that item.”.

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Source: https://www.legislation.gov.uk/uksi/1988/1287/regulation/4 (the official version)
Page: https://openlegislation.uk/road-vehicles-construction-and-use-amendment-no5-regulations-1988/regulation-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.