D-value (transport)

D-value (transport)

In transport, D-value is a rating in kN that is typically attributed to mechanical couplings, and reflects dynamic loading limits between a towing vehicle and a trailer. The corresponding formula for a truck and trailer combination, used to determine the required D-value of a coupling, is:

D (kN) = 9.81 x (Gross Vehicle Mass X Gross Trailer Mass)/(Gross Combination Mass).

The vehicle masses are in tonnes, and the 9.81 factor converts this to kN. GVM refers to the towing vehicle (including any vertical loads passed on to the towing vehicle via the coupling), GTM refers to the axle loads only of the towed vehicle, and GCM refers to the total mass of the combination.


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