2.7.1. Types of vertical curves

Try these first

1. 1.

   Define summit curve.

   Hint

   What type of curve occurs at the top of a hill?

2. 2.

   What is the recommended rate of change for gradients at a summit?

   Hint

   How gradually should we change slopes for comfort?

3. 3.

   What is the main characteristic of a summit curve?

   • Convex upwards
   • Convex downwards
   • Flat

   Hint

   Think about the shape of a hill.

4. 4.

   True or False: The rate of change for a valley curve should be greater than that of a summit curve.

   • True
   • False

   Hint

   Remember the specifications for design safety.

5. 5.

   Based on a summit curve with a gradient of 2% upward followed by a 1.5% downward, calculate the necessary length of the vertical curve to ensure a smooth transition.

   Hint

   What is the total change in gradient you need to consider?

6. 6.

   Design a valley curve connecting a steep downgrade of 3% to a mild upgrade of 1%, and assess the required sight distance to ensure safety.

   Hint

   Remember that sight distance should account for nighttime conditions too!