2. Angular methods of setting out curves

Try these first

1. 1.

   What is a tangential angle?

   Hint

   Think about where the tangent touches the curve.

2. 2.

   Name one method used for setting out circular curves.

   Hint

   One of them is named after a person!

3. 3.

   What method involves the use of tangential angles for setting out curves?

   • Rankine’s Method
   • Two Theodolite Method
   • Bisection Method

   Hint

   It's named after a person.

4. 4.

   True or False: The Two Theodolite Method is more commonly used than other techniques due to its simplicity.

   • True
   • False

   Hint

   Think about the equipment needed.

5. 5.

   You have a circular curve with a radius of 60m and a chord length of 18m. Calculate the deflection angle using Rankine’s method.

   Hint

   Focus on substituting correctly and performing the arithmetic without a calculator!

6. 6.

   If the Two Theodolite Method was to set out a left-curved road, what specific adjustments must be made in the theodolite readings? Discuss potential terrain challenges.

   Hint

   Think about how you would adapt the settings for visibility and accuracy.