2.4.1. Elements of a compound curve

Try these first

1. 1.

   Define a compound curve.

   Hint

   Think about how roads or paths change direction.

2. 2.

   What is a deflection angle?

   Hint

   Consider the angle made by two lines at a curve's endpoint.

3. 3.

   What is a compound curve?

   • A single arc
   • Two circular arcs connected
   • Three straight lines

   Hint

   Think about road design and smooth transitions.

4. 4.

   Which element is crucial in determining the geometry of a compound curve?

   • True
   • False

   Hint

   Recall the role of angles in geometry.

5. 5.

   Design a compound curve between two straight sections connected by tangents of lengths 40m and 30m. The radii are 50m and 60m with deflection angles 25° and 35°. Calculate the lengths of each arc and set out the angle measurement.

   Hint

   Convert angles to radians before multiplication with radii.

6. 6.

   A road engineer needs to determine the tangent point location between two straight roads intersected by a compound curve. Given the straight lengths and angles, devise a solution for locating point B.

   Hint

   Draw a diagram to visualize locations based on angles.