6.—(1) Where any vehicle, the use of which upon roads is authorised by this Notification, or the load carried by any vehicle so authorised, exceeds 2.9 metres in overall width, at least 4 persons inclusive of the driver or drivers shall be in attendance to attend the vehicle and load:
Provided that where any such vehicle is stationary on a road or is actually engaged in engineering operations and moves on a road only to the extent necessary for the efficient performance of such operations it shall be sufficient compliance with this paragraph if one person in addition to the driver or drivers is in attendance.
(2) Where any vehicle, the use of which upon roads is authorised by this Notification, or the load carried by any vehicle so authorised, exceeds 2.4 metres but does not exceed 2.9 metres in width at least one person in addition to the driver or drivers shall be in attendance to attend the vehicle and load.