Transition Curve Deflection Angle Calculator

Spiral curve or Transition curve is used in the highways and railroad tracks to control changes in the lateral acceleration. It is a mathematically calculated curve where a straight line turns into a curve. It is used to change the curvature and superelevation of the roads. Use our online transition curve deflection angle calculator to know how to use the spiral/transition curve and find the deflection angle to any point on the curve.

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Use the formula to find the deflection angle to any point on the curve by computing the length of spiral from tangent to any point, length of spiral and radius of simple curve. Use our transition curve deflection angle calculator to find the spiral easement.