2.31. Show the various elements of a compound curve.

Try these first

1. 1.

   What is a compound curve?

   Hint

   Think about the shape it forms.

2. 2.

   Define a tangent point.

   Hint

   Consider where a road curves into a straight.

3. 3.

   What defines a compound curve?

   • A single arc
   • Two or more circular arcs
   • Only straight lines

   Hint

   Consider how curves are formed.

4. 4.

   True or False: The tangent point is where the curve ends.

   • True
   • False

   Hint

   Think about where a road curves to become straight.

5. 5.

   A road design needs a compound curve that connects two different roads with 25° and 45° angles. Identify the radius needed for this design.

   Hint

   Consider the overall flow and safety of the vehicle.

6. 6.

   Design a compound curve with a radius of 150 m and 200 m that transitions between two straights. Calculate all key elements.

   Hint

   Use the relationships between angles and curvature to derive your values.