2.58. The bearings of three successive intersecting straights AB, BC and CD along the centre line of a proposed highway...

Try these first

1. 1.

   Define what a bearing is.

   Hint

   Think about how you would describe a direction on a compass.

2. 2.

   What does chainage refer to?

   Hint

   Relate it to measuring a route on a map.

3. 3.

   What is the bearing for line AB?

   • 103°29'24"
   • 125°43'22"
   • 116°12'54"

   Hint

   Refer back to how bearings are defined.

4. 4.

   True or False: The chainage increases from point A to point D in the highway.

   • True
   • False

   Hint

   Think about the flow of traffic.

5. 5.

   Given a road section with bearings AB = 90°, BC = 135°, and CD = 180°, calculate the required changes in radius for a smoother transition.

   Hint

   Ensure all angles are measured from the north direction.

6. 6.

   Calculate the distance required between tangent points if AB has a radius of 250 m and a deflection angle of 45°. Discuss implications of changes in curve length.

   Hint

   Think of how road curvature affects vehicle dynamics.