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Superelevation problem

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acpico
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Superelevation problem

Attached herewith is a road design PDF.
The superelevation does not follow generic rule (apply at spiral start point and end at Tangent point). Meanwhile, we need to apply the following rule to compute the changes in superelevation

Function VariesFall(StartCH, EndCH, FirstFall, SecondFall, CH) As Double

VariesFall = _
FirstFall + (SecondFall - FirstFall) / 2 * _
(1 - Cos((180 * (CH - StartCH) / (EndCH - StartCH)) * PI / 180)) End Function

Where Firstfall stands for the starting superelevation, and the Second fall stands for the ending superelevation.

Is there any method to apply the above?
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