In the application of sections 68 to 76 of this Act (except so far as those sections relate to any head lamps required to be carried under section 68(2) thereof) in the case of a vehicle drawing one or more vehicles the following modifications shall, subject to the following provisions of this section, apply:—
(a) lamps showing lights to the front need not be carried on any vehicle being drawn;
(b) lamps showing red lights to the rear need not be carried on any of the vehicles except the rearmost vehicle;
(c) reflectors facing to the rear need not be carried on any of the vehicles except the rearmost vehicle or a vehicle more than five feet from the vehicle behind it.
If the distance between any two of the vehicles exceeds five feet, then as respects any light to be shown to the rear the foremost of the two vehicles, and as respects any light to be shown to the front the rearmost of the two vehicles, shall be required to carry the same lamps as if the one were not drawing the other.
If a vehicle being drawn or any load carried thereon projects laterally on any side more than twelve inches beyond the outermost of the lamps showing a white light to the front on that side carried by the vehicle by which it is being drawn or by any preceding vehicle which is also being drawn by the same vehicle, the first-mentioned vehicle shall carry on the side on which the vehicle or its load so projects a lamp showing to the front a white light visible from a reasonable distance in such a position that no part of the vehicle or its load projects laterally more than twelve inches beyond a vertical line through the centre of the lamp required to be carried by this subsection.
This section shall have effect subject to the provisions of any regulations made under section 76(4) of this Act in the case of any vehicles to which those regulations apply.
For the purposes of this section, the distance between two vehicles shall be measured between the nearest points of those vehicles, disregarding the drawbar and any fitting for its attachment.