2.3.3. Elements of a simple circular curve

Try these first

1. 1.

   What is the definition of a tangent in a circular curve?

   Hint

   Think of it as a line that barely grazes the curve.

2. 2.

   What is an intersection point?

   Hint

   It's the meeting point of straight lines in a curve.

3. 3.

   What is the apex distance in a circular curve?

   • Distance from curve to endpoint
   • Distance from intersection to apex
   • Distance around the curve

   Hint

   Recall that apex is always related to the curve.

4. 4.

   True or False: The deflection angle is the angle between the two tangents at the intersection point.

   • True
   • False

   Hint

   Remember the geometry of tangents involved.

5. 5.

   A simple circular curve has a radius of 80m and sustains a deflection angle of 60°. Calculate the lengths of the tangents and apex distance using appropriate formulas.

   Hint

   Break down the formulas step by step.

6. 6.

   If a circular curve's central angle is 90° and the radius is 70m, find the length of the curve and the long chord.

   Hint

   Use the circular geometry concepts effectively.