Transition curves are introduced at either end of a circular curve to obtain

gradual increase of super-elevation from zero at the tangent point to the specified amount at the junction of the transition curve with main curve

gradually decrease of curvature from zero at the tangent point to the specified quantity at the junction of the transition curve with main curve

gradual change of gradient from zero at the tangent point to the specified amount at the junction of the transition curve with main curve

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