18.1. Calculate the RL of various stations

Try these first

1. 1.

   What is the formula for calculating the tangent length T?

   Hint

   Think about how radius and angle relate in circular motion.

2. 2.

   Define chainage.

   Hint

   It relates to position on a road.

3. 3.

   What does chainage refer to in surveying?

   • Distance along a road
   • Width of the road
   • Type of curve

   Hint

   Focus on what you measure from the starting point.

4. 4.

   True or False: The radius of a curve affects its sharpness.

   • True
   • False

   Hint

   Think about how a circle works.

5. 5.

   A road design requires a circular curve of 800 m radius with a deflection angle of 120°. Calculate the tangent length and the total length of the curve.

   Hint

   Make sure to convert the angle correctly when using formulae.

6. 6.

   Discuss how an incorrect radius calculation can lead to unsafe road conditions.

   Hint

   Consider real-world driving experiences.