18.2.1. Design Considerations

Try these first

1. 1.

   What is a valley curve?

   Hint

   Think about the shape it forms due to two gradients.

2. 2.

   Why is headlight distance important?

   Hint

   What do we rely on at night when driving?

3. 3.

   What is the primary function of a valley curve?

   • To provide headlight visibility
   • To create a smooth vehicle transition
   • To increase downhill speeds

   Hint

   Consider the purpose of smooth transitions in driving.

4. 4.

   True or False: The stopping sight distance is not a factor in valley curve design.

   • True
   • False

   Hint

   Think about safety when it comes to stopping distances.

5. 5.

   Given a design speed of 70 km/h and a required stopping sight distance of 120 m, calculate the length of the valley curve using comfort criteria.

   Hint

   Remember to apply the values properly into the formula.

6. 6.

   If a valley curve has an inappropriate radius affecting the stopping sight distance, discuss the likely outcomes and safety implications.

   Hint

   Think about how a driver's ability to see in advance affects their reaction time.