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GATE 2017 CE (CE2) – Question 32

Transportation Infrastructure · Geometric design of roadways: cross-section, sight distance, alignments · 1 mark · Numerical answer

For a parabolic vertical curve, the horizontal distance between the point of vertical intersection and point of vertical curvature is 100 m. The curve length is ______ m.

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Correct answer: 199.99 to 200.01

Explanation

For the standard equal-tangent parabolic vertical curve, the horizontal VPC-to-VPI distance is half its length. Thus $L/2=100$, giving $L=200$ m.