17.3.2. Design Consideration

Try these first

1. 1.

   What are summit curves?

   Hint

   Think about how roads transition from an uphill to a downhill section.

2. 2.

   Why is sight distance important?

   Hint

   Consider the time it takes to react to a sudden stop.

3. 3.

   What is the primary purpose of summit curves?

   • To improve vehicle speed
   • To ensure safe transitions
   • To reduce maintenance costs

   Hint

   Think about the road’s purpose for safety.

4. 4.

   True or False: Circular summit curves provide varying sight distances.

   • True
   • False

   Hint

   Consider how curvature impacts visibility.

5. 5.

   Design a summit curve for a road with an SSD of 150 meters and a deviation angle of 6°. Calculate its length and discuss the impact of gradient changes on your design.

   Hint

   Refer to the equations and methodologies discussed in class.

6. 6.

   Evaluate the trade-offs between using a parabolic curve versus a circular curve in your design plans for a new highway segment, considering rider comfort, construction difficulty, and safety.

   Hint

   Reflect on the advantages and disadvantages outlined in our discussions.