33.2.3. Boundary Conditions

Try these first

1. 1.

   Define jam density.

   Hint

   Consider what happens when traffic is heavily congested.

2. 2.

   What does free-flow speed represent?

   Hint

   Think about how fast you could drive in ideal conditions.

3. 3.

   What is jam density?

   • A. Maximum speed at free flow
   • B. Maximum density of vehicles in traffic
   • C. Average flow rate

   Hint

   Think about the point at which traffic becomes too congested.

4. 4.

   True or False: Free-flow speed is the speed at which congestion begins.

   • True
   • False

   Hint

   Remember what happens in ideal conditions versus congested conditions.

5. 5.

   A highway has a jam density of 150 vehicles/km and a free-flow speed of 90 km/h. Calculate the maximum flow.

   Hint

   Substitute your known values into the maximum flow formula.

6. 6.

   If the maximum flow on a given section of road is measured at 5000 vehicles/hour, what would be the jam density if the free-flow speed is 70 km/h?

   Hint

   Make sure to work step by step through the rearrangement.