4.3. Example 2.3

Try these first

1. 1.

   What is super-elevation?

   Hint

   Think about how roads are designed to help vehicles navigate curves.

2. 2.

   What does a transition curve do?

   Hint

   Consider how a curve makes turning easier.

3. 3.

   What is the main purpose of super-elevation in road design?

   • To increase speed limits
   • To counteract centrifugal force
   • To reduce traffic congestion

   Hint

   Think about a car going around a curve.

4. 4.

   True or False: Transition curves are unnecessary for highways.

   • True
   • False

   Hint

   Consider why roads might need to smoothen transitions.

5. 5.

   If a car with a mass of 1500 kg travels around a curve of radius 250 m at a speed of 80 km/h, calculate the forces acting on the car, including super-elevation.

   Hint

   Use f = mv²/r for centrifugal force.

6. 6.

   Determine the length of a transition curve given a super-elevation of 0.08 and a speed of 90 km/hr.

   Hint

   Express speed in m/s and consider the curve radius.