The shape of the grip that can move the PVI position of a profile and change the slope of both tangents in the profile is ______.

• A. Circle
• B. Diamond
• C. Upright Triangle
• D. Square

Answer: (C)

Moving the Point of Vertical Intersection (PVI) and adjusting how steep the surrounding tangents are happens with the grip that is drawn as an upright triangle. In profile editing, this grip is tied to the PVI itself: when you drag it along the profile, you relocate the intersection point where the two vertical tangents meet, and because the tangents must converge at that point, both of their slopes update accordingly. This is what allows you to reshape the vertical curve so that both sides’ grades change in tandem. Other grip shapes are used for editing different aspects of the profile (such as moving other points or changing one tangent), but they don’t relocate the PVI and thus don’t simultaneously alter both tangent slopes.