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Transition curve is provided to change the horizontal alignment from straight
to circular curve gradually and has a radius which decreases from infinity at
the straight end (tangent point) to the desired radius of the circular
curve at the other end (curve point)
There are five objectives for providing transition curve and are given below:
- to introduce gradually the centrifugal force between the tangent point
and the beginning of the circular curve, avoiding sudden jerk on the
vehicle.This increases the comfort of passengers.
- to enable the driver turn the steering gradually for his own comfort and
security,
- to provide gradual introduction of super elevation, and
- to provide gradual introduction of extra widening.
- to enhance the aesthetic appearance of the road.
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