17.3.3.1. Case a. Length of summit curve greater than sight distance

Try these first

1. 1.

   What is a summit curve?

   Hint

   Think about how hills transition in roads.

2. 2.

   Define sight distance.

   Hint

   Consider how far ahead you need to see while driving safely.

3. 3.

   What is a summit curve?

   • A type of straight road
   • A vertical curve connecting upward gradients
   • An angle of intersection

   Hint

   Think about how a road might change when going uphill.

4. 4.

   True or False: The driver's eye height impacts sight distance calculations.

   • True
   • False

   Hint

   Consider how tall objects can block your view.

5. 5.

   A road has a driver's eye height of 1.2 meters and an obstruction of 0.3 meters. Calculate the length of the summit curve if the sight distance needed is 120 meters.

   Hint

   Refer to the relationships established in case 'a' for calculation.

6. 6.

   Given two gradients, n1 = +5% and n2 = -3%, derive the summit curve's length when the sight distance is 150 meters.

   Hint

   Focus on understanding how to apply the equations derived from the section.