15.1. Overview

Try these first

1. 1.

   What is superelevation?

   Hint

   Think about how banked turns in sports help maintain speed.

2. 2.

   What is the maximum superelevation for urban roads according to IRC guidelines?

   Hint

   Remember, urban settings tend to have more complexities in traffic.

3. 3.

   What is the primary purpose of superelevation?

   • To increase road width
   • To counteract lateral forces
   • To provide drainage

   Hint

   Think about how curves affect vehicle motion.

4. 4.

   Is the maximum superelevation for rolling terrain greater than for urban roads?

   • True
   • False

   Hint

   Consider the stability factors affecting different terrains.

5. 5.

   Given a curve with a radius of 300 m and necessary superelevation of 0.06, calculate the design speed for a vehicle assuming a coefficient of lateral friction of 0.12.

   Hint

   You will need to apply the values for R, e, and f in the equation.

6. 6.

   Discuss the consequences of insufficient superelevation in a highway curve.

   Hint

   Think of the physics at play when vehicles approach curves.