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:

T = Weight of towing vehicle including the vertical load on the fifth wheel
R = Total weight of the loaded semi-trailer
U = Vertical load on the fifth wheel
g = Acceleration due to gravity (assumed to be 9.81 m/s 2 )

D (kN) = g x ((0.6 x T x R)/(T + R - U))[1]

References

  1. ↑ "Calculation of D-Value for Tractor and Semi-Trailer Combinations" (PDF). www.safholland.com. Archived from the original (PDF) on 2014-06-06.
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