Civil Engineering MCQAE Level Civil Engineering
On a highway, a summit (crest) vertical curve of length L is designed using SSD. When L > SSD, the minimum length is:
Transportation EngineeringSummit CurveMEDIUM
Choose the correct answer
A
L = N x SSD^2 / (2 x SSD)
B
L = N x SSD^2 / (h1 + h2)^2 x K
C
Based on L = N x SSD (linear)
D
L = N / SSD
Correct Answer
B. L = N x SSD^2 / (h1 + h2)^2 x K
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Summit curve (L > SSD): L = N x S^2 / (sqrt(2h1) + sqrt(2h2))^2, where N = algebraic grade difference (%), S = SSD, h1 = driver eye height (1.2 m), h2 = object height (0.15 m for SSD). IRC uses L = K x N (K-value method).
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