64   Method of determining wheel loads

(1)  For the purpose of determining the wheel load of a wheel of a motor vehicle or a trailer, the wheel is to be weighed (alone or together with any other wheel or wheels forming an axle group of which the wheel the weight of which is being determined forms part) in such a way that the wheel or wheels are weighed together with the portion of the vehicle and load supported by the wheel or wheels.

(2)  If the wheel load of a wheel is determined under subclause (1) by weighing the wheel with other wheels, the load of the wheel the load of which is being determined is the mass of all the wheels so weighed divided by the number of wheels so weighed.