Spiral Curve: How to Calculate Exactly

Spiral curves have been used in engineering design for centuries, most prominently for railroads coincident with the worldwide boom in railway construction in the late 1800s. Many who have had to lay out or retrace spiral curves (especially any offsets) might have secretly cursed whoever chose to add them to the design and perhaps even questioned the need for spiral curves.

The Myth that "there is no such a thing as a true spiral curve offset" has finally been busted. A 35+...
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Spiral curves have been used in engineering design for centuries, most prominently for railroads coincident with the worldwide boom in railway construction in the late 1800s. Many who have had to lay out or retrace spiral curves (especially any offsets) might have secretly cursed whoever chose to add them to the design and perhaps even questioned the need for spiral curves.

The Myth that "there is no such a thing as a true spiral curve offset" has finally been busted. A 35+ year endeavor has resulted in a method and formulas to calculate a true parallel offset curve to a centerline spiral curve.