Of which:DGI gives: the value exceeds the area between the central axisDga: the value exceeds the area outside the central axisa: the distance between the central axisNI: distance between the axis of the Center to the center axis of cross-sectionNA: the distance from the center axis to cross outside the central axisp: axial price gapR: the smallest curvature RADIUS(1) for example, train 3 trailersa = 11,000 mNI = the most detrimental case located in the middle of two central axisNI = 11/2 = 5, 5 mp = 2 mna = the distance from the center axis to the most restrictive from central axis facing down or up
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