What describes a vertical curve formed by a downward tangent followed by an upward tangent?

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Multiple Choice

What describes a vertical curve formed by a downward tangent followed by an upward tangent?

Explanation:
Vertical curves are used to smoothly connect two different grades in a grade profile. When the road goes from a downward slope to an upward slope, the profile forms a valley, bending downward first and then upward. This shape is called a sag vertical curve, indicating a dip in the profile. It’s the opposite of a crest vertical curve, which occurs when the grade changes from up to down and produces a peak. A generic term like “curve” doesn’t specify the valley shape, and while some may call it a dip, the standard term used in design is sag.

Vertical curves are used to smoothly connect two different grades in a grade profile. When the road goes from a downward slope to an upward slope, the profile forms a valley, bending downward first and then upward. This shape is called a sag vertical curve, indicating a dip in the profile. It’s the opposite of a crest vertical curve, which occurs when the grade changes from up to down and produces a peak. A generic term like “curve” doesn’t specify the valley shape, and while some may call it a dip, the standard term used in design is sag.

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