4.4. Example 2.4

Try these first

1. 1.

   What is super-elevation?

   Hint

   Think about curves in roads.

2. 2.

   Define a transition curve.

   Hint

   Consider how curves change shape.

3. 3.

   What is the main purpose of super-elevation?

   • To increase the speed limit
   • To counteract centrifugal force
   • To improve fuel efficiency

   Hint

   Think of curves!

4. 4.

   True or False: Transition curves are always circular.

   • True
   • False

   Hint

   Consider their design principles.

5. 5.

   Calculate the necessary super-elevation for a vehicle moving at 90 km/h on a curve with a radius of 300 m. Show your working.

   Hint

   Convert speed to m/s first.

6. 6.

   Given a design scenario where the transition curve must last for 200 m, designed for a vehicle speed of 70 km/h, determine the super-elevation and how it affects passenger comfort.

   Hint

   Pay attention to pitch and roll factors.