15. Horizontal Alignment II

Try these first

1. 1.

   What is superelevation?

   Hint

   Think about how roads are designed for curves.

2. 2.

   What do we mean by mixed traffic in road design?

   Hint

   Consider the types of vehicles you see on the road.

3. 3.

   What is the purpose of superelevation?

   • To improve drainage
   • To enhance vehicle safety
   • To reduce costs

   Hint

   Think about how roads keep drivers safe on curves.

4. 4.

   True or False: Minimum superelevation for drainage purposes is typically between 2-4%.

   • True
   • False

   Hint

   Consider how water flows on roads.

5. 5.

   A road designed for a speed of 90 km/h encounters a curve with a radius of 300 m. Calculate the necessary superelevation and assess safety if this curve is used for mixed traffic. Discuss considerations related to heavier vehicles.

   Hint

   Remember to adjust for truck characteristics.

6. 6.

   Given a multi-lane road with a design speed of 70 km/h and a radius of 600 m, determine the necessary total extra widening. Integrate both mechanical and psychological widening in your calculations.

   Hint

   Refer to the IRC guidelines for formulations.