Paragraph 5 Marking of wide loads
Subject to sub-paragraph (d), every load carried on a vehicle in circumstances where this paragraph applies shall be fitted on each side and in the prescribed manner, with—
a prescribed marker in such a position that it is visible from the front of the vehicle, and
a prescribed marker in such a position that it is visible from the rear of the vehicle;
for the purposes of sub-paragraph (a)—
a marker on a side of the load is fitted in the prescribed manner if at least part of it is within 50mm of a longitudinal plane passing through the point on that side of the load which is furthest from the axis of the vehicle; and
a prescribed marker is a marker of the size, shape and colour described in Part II;
every marker fitted pursuant to this paragraph shall be kept clean and between sunset and sunrise be illuminated by a lamp which renders it readily visible from a reasonable distance and which is so shielded that its light, except as reflected from the marker, is not visible to other persons using the road;
if the load does not extend beyond the longitudinal plane passing through the extreme projecting point on one side of the vehicle, it shall not be necessary for a marker to be fitted to the load on that side.