The main advantage of providing transition curves on highways, is
[A].
to obtain transition from the tangent to the circular curve and from the obtain transition from the tangent to the circular curve and from the circular to the tangent
[B].
to obtain a gradual increase of curfature from a value of zero at the tangent to a maximum at the circular curve
[C].
to have a gradual increase of super-elevation from zero at the tangent to a specific maximum at the circular curve
