In highway curves, what does "PC" stand for?

In the context of highway curves, "PC" stands for Point of Curvature. This term refers to the specific point at which a straight section of road begins to transition into a curve. It is a critical element in road design and alignment because it marks the beginning of the circular arc that defines a curve in the roadway. Proper identification and measurement of the Point of Curvature are essential for ensuring that the curve has the correct radius and alignment, which directly impacts vehicle safety and comfort.

The concept of the Point of Curvature helps engineers design smooth transitions and maintain proper sight distances for drivers approaching the curve. Understanding this point is crucial in the overall geometric design of highways, as it aids in calculating other important points such as the Point of Tangency and the Point of Beginning. The other options do not accurately capture this specific function related to highway design.