GATE CE 2022 Set 1 — Question 28
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Transportation Engineering → Horizontal & Vertical Alignment → Horizontal Alignment
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Question
A horizontal curve is to be designed in a region with limited space. Which of the following measure(s) can be used to decrease the radius of curvature?
Correct answer
(A) Decrease the design speed.; (B) Increase the superelevation.
Solution
The radius of curvature for a horizontal curve is given by the formula:where:
- is the superelevation
- is the coefficient of lateral friction
- is the design speed
- is the acceleration due to gravity
1.Decrease the design speed (): Since , decreasing will decrease . (Option A is correct)
2.Increase the superelevation (): Since , increasing will decrease . (Option B is correct)
3.Increasing design speed would increase . (Option C is incorrect)
4.Vehicle weight does not directly appear in the geometric design formula for radius. (Option D is incorrect)
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