REQUIREMENTS OF A TRANSITION CURVE

1. It must originate and meet the straights at zero curvature i.e. at contact points T₁ and T₂, the radius of curvature must be infinite.
2. It must meet the circular curve of radius R tangentially i.e. radius of curvature at contact points C and C’ is equal to the radius of curve i.e. R.
3. The length of transition curve must be such that full super-elevation is achieved at the contact points C and C’.
4. The rate of increase of curvature along the transition curve should be equal to the rate of increase of super-elevation.

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