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Q1: An ideal transition curve is

A cubic parabola

B cubic spiral

C clothoid spiral

D true spiral.

ANS:C - clothoid spiral

IRC recommends Spiral or clothoid as the ideal transition curve due to following reasons: 1. It satisfies that rate of change of centrifugal acceleration is constant i.e., Ls.R = constant. Where Ls = length of transition curve R = radius of curve. 2. The calculation and field implementation of spiral curve is simple and easy. 3. It enhances aesthetics also.



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