15.5. Summary

Try these first

1. 1.

   Define superelevation.

   Hint

   Think about how the road is tilted.

2. 2.

   What does IRC stand for?

   Hint

   An organization that provides road design guidelines.

3. 3.

   What is the maximum superelevation percentage allowed on plain terrains according to IRC?

   • 7%
   • 10%
   • 4%

   Hint

   Think about the terrain type.

4. 4.

   True or False: Superelevation is not necessary for straight roads.

   • True
   • False

   Hint

   Consider the purpose of superelevation.

5. 5.

   A curve has a radius of 200 m. With a design speed of 60 km/h and a friction factor of 0.15, calculate the required superelevation using the IRC guidelines.

   Hint

   Begin by converting speed to m/s and apply the formula for e.

6. 6.

   Evaluate the impact of increasing truck traffic on existing urban road curves if currently designed for lower speeds, and suggest design changes.

   Hint

   Consider how heavier vehicles affect road design.