Sample Problem: Vertical Curve Elevation at Any Point
Applying the parabolic equation to find road elevations.
Example
A equal-tangent crest vertical curve connects an ascending grade of () and a descending grade of (). The Point of Vertical Intersection (PVI) is located at station with an elevation of . Determine the elevation of the curve at station .
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Sample Problem: Finding the High Point on a Crest Curve
Locating the point of zero slope for drainage design.
Example
Using the same curve parameters as the previous example (, , , , ), determine the station and elevation of the highest point on the curve.
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Sample Problem: Minimum Length of a Crest Vertical Curve (Sight Distance)
Ensuring a driver can see over the hill crest.
Example
A crest vertical curve must be designed to connect a grade and a grade. The required Stopping Sight Distance (SSD) for the design speed is . Assuming the driver's eye height is and the object height is , what is the minimum required length of the vertical curve () if we assume the curve length is greater than the sight distance ()?
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Sample Problem: Sag Vertical Curve Sight Distance (Headlight Criteria)
Ensuring vehicle headlights illuminate the road far enough ahead in a dip.
Example
A sag vertical curve connects a grade to a grade. The design speed requires a Stopping Sight Distance () of . Standard headlight height () is , and the upward divergence angle () of the headlight beam is . Calculate the minimum required length of the sag curve assuming .
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Case Study: Application of Vertical Curve Types
Analyzing real-world scenarios for crest and sag curves.
Example
A new highway alignment must cross an existing railroad track via an overpass bridge, and immediately afterward pass under a high-voltage power line corridor. Describe the sequence of vertical curves required and the primary engineering concerns for each.
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