15.2. Guidelines on superelevation

Try these first

1. 1.

   What is the primary purpose of superelevation on a curve?

   Hint

   Think about the forces acting on vehicles taking turns.

2. 2.

   What does IRC stand for?

   Hint

   It is the organization that provides guidelines for road design in India.

3. 3.

   What is the maximum superelevation for plain terrain according to IRC?

   • 7%
   • 10%
   • 4%

   Hint

   Think about the types of terrain and their requirements.

4. 4.

   True or False: The design vehicle refers to the heaviest vehicle type considered in road design.

   • True
   • False

   Hint

   Think about how we use standards for design.

5. 5.

   Design a curve for a highway with a radius of 200 m and a speed limit of 100 km/h. Calculate superelevation and determine if it meets IRC guidelines.

   Hint

   Check IRC limits after calculating the initial e.

6. 6.

   For a heavy truck traveling at 40 km/h around a curve with a radius of 75 m, determine the necessary superelevation considering a high center of gravity that requires lower superelevation.

   Hint

   Think about how vehicle dynamics change with speed and load.