2.71. A road having an up-gradient of 1 in 15 is to be connected to a down-gradient of 1 in 20...

Try these first

1. 1.

   What is the significance of a vertical parabolic curve in road design?

   Hint

   Think about the driver's experience on a road.

2. 2.

   How is gradient expressed in road design?

   Hint

   Consider how steepness is denoted mathematically.

3. 3.

   What is the primary purpose of a vertical parabolic curve in road design?

   • To connect two straights
   • To improve visibility
   • To reduce costs

   Hint

   Think about why visibility is crucial for roadways.

4. 4.

   Visibility distance can be affected by which of the following?

   • True
   • False

   Hint

   Look at how eyesight and roadway design interact.

5. 5.

   Given a new gradient of 1 in 10, design a parabolic curve considering driver visibility. Calculate all necessary dimensions to maintain a 200 m visibility.

   Hint

   Consider how steeper gradients require adjustments in curve length for safety.

6. 6.

   Analyze the current visibility distance for a parabolic curve with specified eye height and adjust it for safety improvements.

   Hint

   Refer back to visibility calculations made in previous examples.