2.66. A 10 m wide road is to be deflected through an angle of 35°30'.

Try these first

1. 1.

   Define transition curve.

   Hint

   Think of how sharp turns feel.

2. 2.

   What is the super-elevation?

   Hint

   How the road tilts in a curve.

3. 3.

   What is the purpose of a transition curve?

   • To increase road speed
   • To provide a gradual change in direction
   • To decrease road width

   Hint

   Consider the effect on driving.

4. 4.

   Is super-elevation crucial for all road curves?

   • True
   • False

   Hint

   What happens to vehicles on curves?

5. 5.

   For a 10 m wide road with a deflection angle of 40°, calculate the necessary super-elevation at a speed of 70 km/h. Social factors should be taken into account.

   Hint

   Adjust for the angle and speed!

6. 6.

   Design a transition curve for a new highway with a deflection angle of 30°, discussing material choices for construction on varying terrains.

   Hint

   Consider the cohesion of materials.