How does the PVI height compare to the highest point on a crest vertical curve?

In the context of vertical curves in roadway design, the Point of Vertical Intersection (PVI) is a significant geometric feature. It represents the point where two curve tangents intersect. For a crest vertical curve, which is an upward parabolic shape, the highest point will occur at the vertex of the curve.

The PVI, by definition, is typically located at the midpoint of the curve's length. However, for a crest vertical curve, the actual highest point—the vertex—sits above the PVI. This is because the curve rises to a peak before beginning to descend again. Therefore, the vertex of the curve, which represents the maximum elevation of the roadway, is indeed higher than the PVI. Understanding this relationship is essential for proper design and ensures safe vertical alignment on roadways.

Consequently, the correct answer reflects that the height of the PVI is lower than the highest point of a crest vertical curve.