Q. The object of introducing a transition curve at each end of the circular curve is ?

• (A) to provide a satisfactory means of obtaining a gradual increase of super-elevation from zero on the tangent point to the specified amount on the main circular curve
• (B) to accomplish gradually the transition from the tangent to the circular curve and from the circular curve to the tangent
• (C) to obtain a gradual increase of curvature from zero at the tangent point to the specified quantity at the junction of the transition curve with the circular curve
• (D) all of the above