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The vertical alignment of a road, expressed as a series of grades, connected by parabolic curves is called ___________

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The vertical alignment of a road, expressed as a series of grades, connected by parabolic curves is called ___________

(a) curb

(b) cant

(c) profile

(d) curve

The question was posed to me in a job interview.

The question is from Estimate of Earthwork by Three Methods topic in section Road Estimating, Sanitary and Water Supply Work of Civil Engineering Drawing

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The correct option is (c) profile

Easy explanation: The profile of a road consists of road slopes, called grades, connected by parabolic vertical curves. Vertical curves are used to provide a gradual change from one road slope to another, so that vehicles may smoothly navigate grade changes as they travel.

Sag vertical curves are those that have a tangent slope at the end of the curve that is higher than that of the beginning of the curve. When driving on a road, a sag curve would appear as a valley, with the vehicle first going downhill before reaching the bottom of the curve and continuing uphill or level.

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