How is a three-axle tractor unit capped by axle spread, compared with an articulated vehicle?
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Correct answer: D
A tractor unit is capped at 6 tonnes per metre of axle spread. An articulated vehicle is capped at 5.5 tonnes per metre from king pin to rear axle centre. They are not the same figure, and the tractor unit is not left without a cap. This is the three-axle axle-spread rule in regulation 10 of the Road Traffic (Construction and Use of Vehicles) Regulations 2003, as substituted by the Road Traffic (Construction and Use of Vehicles) (Amendment) (No. 2) Regulations 2014.
CitationSource: Road Traffic (Construction and Use of Vehicles) Regulations 2003 (S.I. No. 5 of 2003), Regulation 10(4), (5) and (6), as substituted by Regulation 11(a) of S.I. No. 253 of 2014, checked on 2026-09-16.