4.1. Example 2.1

Try these first

1. 1.

   What is super-elevation?

   Hint

   Think of how banks are built at curves.

2. 2.

   Define a transition curve.

   Hint

   Consider what happens when a straight road suddenly turns.

3. 3.

   What is the formula for calculating super-elevation?

   • h = (bv^2) / (gR)
   • h = (gbR^2) / v^2
   • h = (vg) / (bR)

   Hint

   Look for the formula that includes v, g, and R effectively.

4. 4.

   True or False: Transition curves can negatively impact vehicle stability if designed inadequately.

   • True
   • False

   Hint

   Think about what happens when vehicles approach a sudden curve.

5. 5.

   Design a roadway with a transition curve for a vehicle speed of 60 m/s and a curve radius of 150 m. Determine the length needed for a smooth transition.

   Hint

   Refer to design guidelines for safe transitions and adjust measurement accordingly.

6. 6.

   A vertical curve is designed to connect two road segments with gradients of +2% and -2%. Determine the ideal length of the vertical curve for smooth transition.

   Hint

   Review how changing gradients affect visibility and comfort.