2.3. Unsolved Numerical Problems

Try these first

1. 1.

   What is a circular curve?

   Hint

   Think about how roads change direction.

2. 2.

   What is meant by the deflection angle?

   Hint

   Consider where two straight lines meet at an angle.

3. 3.

   What defines a simple circular curve?

   • Has a variable radius
   • Maintains a constant radius
   • Connects only straight sections

   Hint

   Consider the nature of the curve.

4. 4.

   True or False: The deflection angle is the angle between the back tangent and forward tangent.

   • True
   • False

   Hint

   Think about geometrical definitions.

5. 5.

   A circular curve needs to be designed at an intersection angle of 90° with a set radius of 300 m. Calculate the lengths of the tangents and the curve.

   Hint

   Utilize tangent and length formulas separately.

6. 6.

   Determine the maximum super-elevation required for a curve with a radius of 200 m going through a curve at a speed of 75 km/h.

   Hint

   Work through units of conversion carefully.