In horizontal curves, which equations are excluded from calculations?

In horizontal curves, which equations are excluded from calculations?

• A. PCsta=PIsta-L
• B. PTsta=PCsta+L
• C. PCsta=PIsta-T
• D. PTsta=PIsta-L

Answer: (C)

In the context of horizontal curve calculations in civil engineering, understanding the terminology and relationships between different points on a curve is essential. The options involve three key points: the Point of Intersection (PI), the Point of Curvature (PC), and the Point of Tangent (PT), along with the length of the curve (L) and the tangent (T). The equation that is excluded from calculations is the one that inaccurately represents the relationship between these points. The equation relating PCsta (Stationing of the Point of Curvature), PIsta (Stationing of the Point of Intersection), and T (Tangent length) is typically not a standard necessary relationship for determining curve characteristics. This is because the Tangent is not used directly in establishing the line between the PI and the PC. In terms of curve design, the relationships between the PI, PC, and PT are critical, and each has specific formulas for determining their stationing based on geometric factors like radius and lengths. The equation involving the tangent length is not required for calculating the locations of PC and PT relative to the PI, as those are typically derived from the length of the curve and the specifics of the road alignment rather than the tangent length. In summary, the relationship involving the tangent

In the context of horizontal curve calculations in civil engineering, understanding the terminology and relationships between different points on a curve is essential. The options involve three key points: the Point of Intersection (PI), the Point of Curvature (PC), and the Point of Tangent (PT), along with the length of the curve (L) and the tangent (T).

The equation that is excluded from calculations is the one that inaccurately represents the relationship between these points. The equation relating PCsta (Stationing of the Point of Curvature), PIsta (Stationing of the Point of Intersection), and T (Tangent length) is typically not a standard necessary relationship for determining curve characteristics. This is because the Tangent is not used directly in establishing the line between the PI and the PC.

In terms of curve design, the relationships between the PI, PC, and PT are critical, and each has specific formulas for determining their stationing based on geometric factors like radius and lengths. The equation involving the tangent length is not required for calculating the locations of PC and PT relative to the PI, as those are typically derived from the length of the curve and the specifics of the road alignment rather than the tangent length.

In summary, the relationship involving the tangent