16. Horizontal Alignment III

Try these first

1. 1.

   What is a transition curve?

   Hint

   Think about the type of curves found in roads.

2. 2.

   What does setback distance ensure?

   Hint

   Consider visibility issues on curvy roads.

3. 3.

   What is the primary purpose of transition curves?

   • To introduce centrifugal force
   • To create sudden changes in road alignment
   • To enhance road aesthetic

   Hint

   Think about why smooth transitions matter.

4. 4.

   The IRC recommends which type of transition curve?

   • Cubical parabola
   • Lemniscate
   • Spiral

   Hint

   Consider which curve helps retain acceleration uniformity.

5. 5.

   Design a transition curve with a radius of 400m for a road with a speed limit of 70 km/h. Calculate the super-elevation and setback needed.

   Hint

   Review the equations we discussed for determining length and super-elevation.

6. 6.

   A vehicle travels around a curve of radius 500m while experiencing curve resistance. If the tractive force is known, calculate the adjusted force that acts during the turn.

   Hint

   Reflect on how angles impact force calculations.