Transition Curve Deflection Angle – Necessary for Passenger Safety

Use this online calculator to know how to use spiral curve to gradually change the curvature and super elevation of road and this is also known as transition curve.

Curve Deflection Angle

To calculate Transition Curve Deflection Angle:

  • Length of spiral from tangent to any point (L)

  • Length of spiral (Ls)

  • Radius of Simple Curve (R)




  • Deflection angle to any point on the curve(i)