4.—(1) Where the length of a forward or rearward projection of a load carried on a relevant vehicle exceeds 2 metres, an end marker must be fitted to the end of the projection.
(2) Sub-paragraph (1) does not apply if a rear marking has been fitted to the projection in accordance with regulation 21 of the Lighting Regulations.
(3) An end marker under sub-paragraph (1) must be fitted so that—
(a)it is as near as is practicable in a transverse plane;
(b)it is not more than 0.5 metre from the extreme end of the projection;
(c)the vertical distance between the lowest part of the end marker and the surface of the road is not more than 2.5 metres;
(d)the end marker, and any means by which it is fitted to the projection, impedes the view of the driver of the vehicle as little as possible; and
(e)the end marker is clearly visible, within a reasonable distance, to a person using the road at the end of the vehicle from which the projection extends.