17.1. Overview

Try these first

1. 1.

   What are summit curves?

   Hint

   Think about how a hill looks.

2. 2.

   Define a gradient.

   Hint

   Relate this to steepness.

3. 3.

   What does vertical alignment refer to?

   • Only horizontal slopes.
   • Gradients and vertical curves.
   • Only vertical slopes.

   Hint

   Remember what each component contributes to road design.

4. 4.

   True or False: Valley curves are convex.

   • True
   • False

   Hint

   Consider the shape of each curve.

5. 5.

   Design a road section with specified gradients and determine the necessary summit curve length for a change in elevation of 30 meters over a distance of 300 meters.

   Hint

   Refer to sight distance formulas and curve definitions.

6. 6.

   Evaluate a proposed vertical alignment for a highway and suggest modifications to improve safety and efficiency.

   Hint

   Consider both vehicle types (heavy and light) and their impact on design.