In the construction industry, on the longitudinal section of the line, the slope point is taken as the intersection point, and the curve connecting the two adjacent slope sections is called the vertical curve.
The vertical curve has two types of convex and concave shapes.
The line profile of the road is usually linear (also called straight slope) and vertical curve, and the two are the basic elements of the vertical section. Parabolic curves are often used for vertical curves because parabola is more convenient than circular curves in design and calculation.
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