Q61GATE 2001MCQ

Camber on highway pavement is provided to take care of

Q62GATE 2001MCQ

A valley curve has a descending gradient of 1 in 40 followed by an ascending gradient of 1 in 50. The length of the valley curve required for a design speed of 80 km/hour for comfort condition is

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📖 Explanation

\begin{aligned} L &=2\left[\frac{N v^{3}}{C}\right]^{1 / 2} \\ &=0.38\left[N V^{8}\right]^{1 / 2} \quad\left[\text { since } C=0.6 \mathrm{m} / \mathrm{s}^{3}\right]\$ \\ N &=\frac{1}{40}-\left(+\frac{1}{50}\right)=\frac{1}{40}+\frac{1}{50}=0.045 \\ \therefore \quad L &=0.38\left[0.045 \times 80^{3}\right]^{1 / 2} \\ &=57.67 \mathrm{m} \simeq 58 \mathrm{m} \end{aligned}