key horizontal alignment (HAL) points

Locations along a horizontal alignment at which transitions occur; HAL points include:

• Point of beginning (POB)
• Point of curvature (PC)
• Point of tangency (PT)
• Point of intersection (PI)
• Tangent to spiral (TS)
• Compound Curve (CC)
• Reverse Curve (RC)
• Curve to Spiral (CS)
• Spiral to tangent (ST)
• Spiral to curve (SC)
• Spiral to spiral (SS)
• Radius point (RP)
• Point on tangent (POT)
• End Point (EP)

See also key vertical alignment (VAL) points.