190Method of calculating weight of motor vehicles and trailers
(1)This section applies for the purposes of the Traffic Acts and of any other enactments relating to the use of motor vehicles or trailers on roads.
(2)The weight unladen of a vehicle or trailer shall be taken to be the weight of the vehicle or trailer—
(a)inclusive of the body and all parts (the heavier being taken where alternative bodies or parts are used) which are necessary to or ordinarily used with the vehicle or trailer when working on a road, but
(b)exclusive of the weight of water, fuel or accumulators used for the purpose of the supply of power for the propulsion of the vehicle or, as the case may be, of any vehicle by which the trailer is drawn, and of loose tools and loose equipment.