# Horizontal Curves Definitions and Formulas

### Horizontal Curve Formulas

There are MANY of these formulas thanks to geometry and trigonometry. This is only a small sampling so that you can view and get related to them when you are away from your reference materials.

### Horizontal Curve Definitions

LC or C - Long chord

D - Degree of Curve

E - External Distance

I - Intersection Angle

L - Length of Curve

M or HSO - Middle Ordinate or Horizontal Sightline Offset

R - Radius of Curve

PC - Point of Curvature

PI - Point of Intersection

PT - Point of Tangency

T - tangent distance between PC and PI, PI to PT

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