15.2.1. Design of super-elevation

Try these first

1. 1.

   What is super-elevation?

   Hint

   Think about how roads are designed to keep vehicles on track while turning.

2. 2.

   What does the acronym 'CFS' stand for in super-elevation?

   Hint

   It relates to the two critical factors in designing for curves.

3. 3.

   What is the maximum super-elevation recommended for plain terrain according to the IRC?

   • 4%
   • 7%
   • 10%

   Hint

   Consider standard guidelines for roadway designs.

4. 4.

   True or False: Slow-moving vehicles benefit from higher super-elevation without considering friction.

   • True
   • False

   Hint

   Focus on how speed relates to required super-elevation.

5. 5.

   A national highway has a curve with a radius of 300 m and a design speed of 75 km/h. Calculate the maximum allowable super-elevation and confirm its adequacy.

   Hint

   Always remember to compare your calculated value to 0.07.

6. 6.

   Given a curve on a local road with a radius of 200 m and mixed traffic conditions, derive a super-elevation approach suitable for safety.

   Hint

   Think about how diverse vehicles behave in real traffic.