17.3.3.2. Case b. Length of summit curve less than sight distance

Try these first

1. 1.

   What is a summit curve?

   Hint

   Think about where the road meets an incline.

2. 2.

   Why is sight distance important in road design?

   Hint

   Consider visibility requirements for vehicles.

3. 3.

   What is the main purpose of summit curves?

   • To connect gradients
   • To reduce road width
   • To increase speed limits

   Hint

   Think about the shape and function of the curve.

4. 4.

   True or False: A taller obstruction requires a shorter sight distance.

   • True
   • False

   Hint

   Reflect on visibility and driver safety.

5. 5.

   You design a road with a summit curve where L = 300 m. Given h1 = 1.2 m and h2 = 0.15 m, calculate the minimum sight distance S.

   Hint

   Pay attention to units when calculating.

6. 6.

   Explain how changing h1 to 1.5 m while keeping h2 constant at 0.15 m affects your sight distance in a summit curve design.

   Hint

   Think about visibility created by height.