Last modified on 25 August 2009, at 15:53
Fundamentals of Transportation/Shockwaves/Additional Problems
- What example or explanation can be given for shockwaves on freeways?
- Explain the 4 phases of traffic diagram and why each has the slope it has.
- How do microscopic and macroscopic models of traffic flow differ?
- Why does flow decrease in phase 3 of the traffic phase diagram?
- What types of events can create rolling roadblocks?
- How is speed calculated from a flow v. density diagram?
- What is a shockwave and how do you compute its speed?
- Can service rate decrease with increasing congestion?
- What factors affect the wave speed?
- What does the slope of the shockwave represent in the graph?
- Is it possible to increase the density of the queue and still have the shockwave going downstream? What would be a an example of this?
- Why is the bottleneck QK curve projected on the mainroad QB curve to find the speed?
- What is Greenshields model, does it accurately predict traffic flow?
- What is the phase in traffic flow, after density is at its max, called?
- What happens to speed when the density increases?
- What does the slope represent in a traffic phase diagram
- Give an example of density rising and speed dropping
- What is ?
- What does it mean when the flow rate begins to decrease in the traffic phase diagram?
- During the bottleneck phase, what happens to flow as density increases? (flow remains constant)
- How can you tell if the queue grows with or against traffic?
- Does the bottleneck always slow traffic?
- How can traffic avoid the bottleneck?
- How do incidents and rolling roadblocks affect shockwaves differently?
- How do speed, density, and flow change during the peak hour
- List six examples where gaps are important.