Q. The main advantage of providing transition curves on highways, is ?

• (A) to have a gradual increase of super-elevation from zero at the tangent to a specific maximum at the circular curve
• (B) to obtain transition from the tangent to the circular curve and from the circular tangent
• (C) to obtain a gradual increase of curvature from a value of zero at the tangent to a maximum at the circular curve
• (D) all of the above