Road Transport (Mass, Loading and Access) Regulation 2005
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.