L范围This Japanese Industrial Standard specifies the dimensions of interchange coupling of truck tractor and semitrailer for securing coupling interchangeability. However, it does not apply to truck tractor of which fifth wheel load exceeds $156.91~\mathrm{kN}$ , semitrailer of which king pin load exceeds $156.91~\mathrm{kN}$ ,two-axle truck tractor of which fifth wheel load exceeds $88.26~\mathrm{kN}$ and two-axle truck tractor equipped with two-axle coupler, etc.

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