18.2.2.1. Comfort criteria

Try these first

1. 1.

   Define the term 'comfort criteria' as used in valley curve design.

   Hint

   Consider the impact on passenger experience.

2. 2.

   What is a valley curve?

   Hint

   Think of how curves help in transitioning between slopes.

3. 3.

   What is the maximum allowable rate of change of centrifugal acceleration for valley curves?

   • 0.4 m/sec³
   • 0.6 m/sec³
   • 0.8 m/sec³

   Hint

   Remember the comfort criteria you learned about.

4. 4.

   True or False: The comfort criteria in valley curves is only relevant for daytime driving.

   • True
   • False

   Hint

   Reflect on visibility issues at night.

5. 5.

   Given a vehicle speed of 90 km/h and a curve radius of 200 meters, calculate the necessary length of the valley curve to ensure comfort for passengers.

   Hint

   Remember to convert the speed and apply it to the formula.

6. 6.

   Discuss how valley curves might need to differ in urban areas compared to rural highways considering both comfort and safety.

   Hint

   Consider traffic and safety patterns in both environments.