33.7. Summary

Try these first

1. 1.

   Define Greenshield’s model.

   Hint

   Think about the basic equation it represents.

2. 2.

   What does jam density refer to?

   Hint

   Consider the scenario where no vehicles can move.

3. 3.

   What is the basic assumption of Greenshield’s model?

   • Speed decreases linearly with density
   • Speed increases exponentially with density
   • Flow is constant regardless of density

   Hint

   Consider how speed behaves as density changes.

4. 4.

   True or False: Shock waves can only move backward in traffic streams.

   • True
   • False

   Hint

   Reflect on the movement of vehicles and how obstructions affect flow.

5. 5.

   Given a free flow speed of 60 km/h and a jam density of 200 vehicles/km, calculate the maximum flow using Greenshield's model.

   Hint

   Make sure you are following the model's guidelines!

6. 6.

   Discuss how different traffic behaviors during peak times deviate from simplistic models like Greenshield’s.

   Hint

   Think about human behavior in traffic.