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  1. An ideal transition curve is

    2. A.

    cubic parabola
    B.

    cubic spiral
    C.

    clothoid spiral
    D.

    true spiral.

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    Answer : Option C

    Explanation :

    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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