Transition Curve Tangent Distance Calculator

The spiral curve is used to gradually change the curvature and superelevation of the road, and so its also called as transition curve. It is a curve where the straight line turns into a curve. Transition curve is designed to control the sudden changes in the lateral acceleration. Use our online transition curve tangent distance calculator to find the tangent distance of the spiral curve.

Enter the length of spiral from tangent to any point (L), length of spiral (L_s) and radius of simple curve (R) in the transition curve tangent distance calculator to find the tangent distance to any point on the spiral curve or transition curve. Also, use the formula for manual calculations.