2.5.1. Elements of a reverse curve

Try these first

1. 1.

   What is a reverse curve in road design?

   Hint

   Think about its shape and its function in roads.

2. 2.

   Name one key benefit of using reverse curves.

   Hint

   Consider their application in real-life scenarios.

3. 3.

   What is a reverse curve?

   • A curve connecting two intersecting straight lines
   • A curve with variable radius
   • A curve consisting of two circular arcs

   Hint

   Think of how the curves connect and their geometrical shape.

4. 4.

   True or False: Super-elevation is essential at reverse curves.

   • True
   • False

   Hint

   Consider the physics of turning vehicles.

5. 5.

   Design a section of a highway using reverse curves. Specify R₁, R₂, and Δ. Calculate the total length and vertical distance.

   Hint

   Check your sine values carefully.

6. 6.

   If the tangential points of a reverse curve are not marked correctly, explain how to adjust for safety and visibility.

   Hint

   Reflect on the effects of curvature on sightlines in road design.