17.3. Summit curve

Try these first

1. 1.

   What is a summit curve?

   Hint

   Think about how roads connect different slopes.

2. 2.

   Name one type of curve used in summit curves.

   Hint

   It's a curve shape that resembles a parabola.

3. 3.

   What is a summit curve?

   • A vertical curve formed by two gradients
   • A horizontal road bend
   • A type of speed limit

   Hint

   Recall the definition of summit curves.

4. 4.

   True or False: Parabolic curves are less comfortable to drive on than circular curves.

   • True
   • False

   Hint

   Consider which curve shape offers a smoother transition.

5. 5.

   Given a road design requiring a summit curve with an SSD of 150m, calculate the necessary length if the upward gradient is +2% and the downward gradient is -2%.

   Hint

   Focus on using the parabola formula for SSD calculations.

6. 6.

   Critique a poorly designed summit curve encountered in your community. Discuss safety risks and potential improvements.

   Hint

   Think about the visibility and comfort issues during drives.