15.6. Problems

Try these first

1. 1.

   Find the required superelevation for a curve with a radius of 200m at a design speed of 60 km/h.

   Hint

   Use the formula e = (0.75v)^2 / gR.

2. 2.

   What is the maximum permissible superelevation in hilly terrain?

   Hint

   Refer to IRC guidelines.

3. 3.

   What is the formula for calculating superelevation?

   • e = (0.75v)^2/(gR)
   • e = (0.9v)^2/(gR)
   • e = (0.5v)^2/(gR)

   Hint

   Think of the parameters involved in lateral forces.

4. 4.

   True or False: The maximum permissible superelevation in urban areas is 7%.

   • True
   • False

   Hint

   Recall the IRC specs for different terrains.

5. 5.

   Design a curve with a radius of 600m allowing a design speed of 100 km/h. Calculate superelevation and check all parameters.

   Hint

   Check your calculations against the IRC maximum values.

6. 6.

   A two-lane road's outer edge needs to be raised. Given the radius is 500m, determine how much elevation is required if e is 0.06.

   Hint

   Use the rotation method for elevation adjustments.