Problem 1 Vertical curves do not have to a) Provide good fit to connecting grade

Question

Problem 1 Vertical curves do not have to a) Provide good fit to connecting grades b) Provide for good storm drainage c) Provide a good fit to ground profile d) Provide adequate superelevation e) Meet maximum specified grades f) Meet points of fixed elevations g) Provide sufficient sight distances Problem 2 Vertical curves are laid out by calculating a) Latitudes and departures b) Tangent offsets c) Coordinates d) Proportions e) (b) and (d) f) (a) to (d) Problem 3 Vertical curves are designed with the stations counted a) Along vertical parabolic curves b) Along a level X-axis c) Along vertical curve tangents Problem 4 Vertical parabolic curves have a constant radius of curvature a) Yes b) Maybe C) No Problem 5 The high or low point of a vertical curve occurs where a) The second differential of the curve function is zero b) The curve radius is zero c) The road is parallel to the horizon in the direction of travel d) The first differential of the curve function is zero e) All of the above f) None of the above g) (c) and (d)

Explanation / Answer

Prob.1 (b)

There is a vertical gradient, which can drain the storm water easily, so no need to provide special storm drainage.

Prob.2. (b) Tangent offsets.

Vertical offsets from the grades tangents are used to locate the points on the curve.

Prob.3. (a) along parabolic curve

The length along a level axis, or along the curve does not have a any significant difference for the low grade parabolic curves, so it doesn't matter if it is counted along the curve or level axis, but as per the definition of the parabolca, more technically correct answer would be to go along the curve.

Prob. 4. (c) No,

These curves are the transition curves, which change the radius constantly along the curve.

Prob.5 g) (c) or (d)

technically both of c and d are correct, because the slope or the first differential is zero where the road is parallel to the horizon.

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