Test 2 (Vertical Curves)

Question 1

Vertical Curves

Answer 1

• Parabolic Arcs

- Directly Affects only: 1. Stationing 2. Elevations

Question 2

Curve Types

Answer 2

• Symmetrical

- Unsymmetrical

Question 3

Configurations

Answer 3

1. Peak - Going over Hill Top
   
   • Tangent lies above the curve
   • The curve crowns upwards
2. Sag Curve (Valley Curve)
   
   • Tangent lies below the curve
   • Curve Slopes downwards

Question 4

Rule #1

Answer 4

• The Elevation of the parabolic arc at the PVI station lies midway between the elevation of the long chord at the PVI station and the Elevation of the PVI

Question 5

Rule #2

Answer 5

• The tangent offsets are proportional to the square of their distances from the point of tangency

Question 6

Special Notes

Answer 6

• Grades change only @ PVI station