Question:
The maximum superelevation to be provided on a road curve is \(1\) in \(15\). If the rate of change of superelevation is specified as \(1\) in \(120\) and the road width is \(10\) m, then the minimum length of the transition curve on either end will be
The maximum superelevation to be provided on a road curve is \(1\) in \(15\). If the rate of change of superelevation is specified as \(1\) in \(120\) and the road width is \(10\) m, then the minimum length of the transition curve on either end will be
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For transition curves,
\[
\boxed{
L=NWe
}
\]
where \(N\) is the allowable rate of change of superelevation.
Updated On: Jul 23, 2026
- \(180\) m
- \(125\) m
- \(80\) m
- \(30\) m
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Concept:
The minimum length of transition curve based on the permissible rate of change of superelevation is
\[
\boxed{
L=N \times W \times e
}
\]
where
\[
N=\text{Rate of change of superelevation},
\]
\[
W=\text{Width of pavement},
\]
\[
e=\text{Superelevation}.
\]
Step 1: Write the given data. \[ N=120 \] \[ W=10\text{ m} \] \[ e=\frac{1}{15} \]
Step 2: Calculate the transition length. \[ L = 120\times10\times\frac{1}{15} = 80\text{ m} \] Hence, \[ \boxed{L=80\text{ m}} \] Therefore, the correct option is \[ \boxed{(C)\;80\text{ m}.} \]
Step 1: Write the given data. \[ N=120 \] \[ W=10\text{ m} \] \[ e=\frac{1}{15} \]
Step 2: Calculate the transition length. \[ L = 120\times10\times\frac{1}{15} = 80\text{ m} \] Hence, \[ \boxed{L=80\text{ m}} \] Therefore, the correct option is \[ \boxed{(C)\;80\text{ m}.} \]
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