2.4. Compound Curves

Try these first

1. 1.

   What is a compound curve?

   Hint

   Think about how it consists of two circular segments.

2. 2.

   Define the term deflection angle.

   Hint

   What happens at the tangent intersections?

3. 3.

   What is the purpose of a compound curve?

   • To connect straights and curves smoothly
   • For aesthetic design
   • None of the above

   Hint

   Think about how roads change direction.

4. 4.

   True or False: Each curve in a compound curve must have the same radius.

   • True
   • False

   Hint

   Recall the definition of a compound curve.

5. 5.

   A compound curve has an inner radius of 50 m and a larger radius of 70 m. Calculate the total length of the curve if the deflection angles are 30° and 45° respectively.

   Hint

   Focus on calculating the lengths separately using their respective angles.

6. 6.

   Discuss the implications of having a miscalculation of the deflection angles in a constructed roadway.

   Hint

   Consider what happens if curves are sharper than intended.