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Chapter 2: Modeling What We’ve Observed: Queuing Systems
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The purpose of this activity is to give you the opportunity to see how queuing system models relate to high
resolution field data.
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Connect your observation of traffic flow at a signalized intersection with a model framework
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Represent and interpret queuing diagrams for a range of traffic flow and control conditions
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Spreadsheet file: A10.xlsx
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Prepare an Excel worksheet that includes the following information:
Tab 1:
Title page with activity number and title, authors, and date completed
Tab 2:
Original data
Tab 3:
Time-space diagram plot with answers to questions from Task 2
Tab 4:
Cumulative vehicle diagram plot
Tab 5:
Uniform delay calculation
Tab 6:
Summary and answers to Critical Thinking Questions
1.
Consider the two estimates of delay from Tasks 4 and 5. Why are they different? How would you refine
your calculation method from Task 4 to reduce this difference in the two delay estimates?
2.
Compare the cumulative vehicle diagram that you prepared in Task 3 with the one that you sketched
in Task 1 of Activity #9. Describe and explain any differences in these two diagrams.
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Using High Resolution Field Data to Visualize Traffic Flow