When a transition curve is inserted between the tangent and circular curve, following conditions shall be fulfilled:
    •    It should meet the original straight tangentially.
    •     It should meet the circular curve tangentially.
    •     Its radius at the junction with straight road should be infinite and with the circular curve should be the same as that of the circular curve.
    •     The rate of increase of curvature along the transition curve should be same as that of increase in superelevation.