Distance between motor vehicles and trailersE+W+S
86.—(1) Where a trailer is attached to the vehicle immediately in front of it solely by means of a rope or chain, the distance between the trailer and that vehicle shall not in any case exceed 4.5 m, and shall not exceed 1.5 m unless the rope or chain is made clearly visible to any other person using the road within a reasonable distance from either side.
(2) For the purpose of determining the said distance any part of either vehicle designed primarily for use as a means of attaching the one vehicle to the other and any fitting designed for use in connection with any such part shall be disregarded.