(1) A contravention of a dimension requirement applying to a heavy vehicle is a "severe risk breach" if—
(a) the subject matter of the contravention is equal to or greater than the severe risk breach lower limit for the dimension requirement; or
(b) the contravention is a severe risk breach of the dimension requirement under subsection (2) or (3).
(2) A contravention of a dimension requirement applying to a heavy vehicle relating to its length is a "severe risk breach" if—
(a) the contravention would only be a substantial risk breach of the dimension requirement as provided by section 106(1)(a) if this subsection were not enacted; and
(b) either—
(i) the rear of the vehicle's load does not carry a sign or warning device required by the national regulations; or
(ii) the vehicle's load projects from it in a way that is dangerous to persons or property.
(3) A contravention of a dimension requirement applying to a heavy vehicle relating to its width is a "severe risk breach" if—
(a) the contravention would only be a substantial risk breach of the dimension requirement as provided by section 106(1)(a) if this subsection were not enacted; and
(b) either—
(i) the contravention happens—
(A) at night; or
(B) in hazardous weather conditions causing reduced visibility; or
(ii) the vehicle's load projects from it in a way that is dangerous to persons or property.