A \(3\%\) downgrade curve is followed by a \(1\%\) upgrade curve and the rate of change of grade adopted is \(0.1\%\) per \(20\) m length. The length of the respective vertical curve is
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For vertical curves,
\[
\boxed{
L=\frac{\text{Algebraic difference of grades}}
{\text{Rate of change of grade}}
\times
\text{Specified length}
}
\]
Always use the algebraic difference of the two gradients.