Axle spread is the distance measured in metres between the first and last axles of the vehicle (for articulated vehicles the distance measured is from the king-pin to the centre of the last axle of the semi-trailer) and the authorised weight is the number equal to the product of the axle spread and a weight factor (from Table 1 in Maximum Authorised Weights for Vehicles), rounded up to the nearest 10kg, providing that number is less than the maximum authorised weight shown in Table 2 as appropriate.

For the purposes of this example, Table 1 is repeated below.

Table 1: Weight Factors for Rigid Motor Vehicles, Tractor Units, Trailers and Articulated Vehicles


Weight Factor (kg/m)

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