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Chapter 9: Right of Way Change: Change and Clearance Intervals
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The purpose of this activity is to provide you with the opportunity to learn about the variability of how
drivers respond to the yellow indication, including how distance and time from the intersection at the onset
of yellow affects the driver’s likelihood of stopping (or not).
•
Describe the different responses of drivers to the yellow indication based on their location upstream
of the intersection
•
Compare field data with the theoretical basis of stopping
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Data file: A54.xlsx.
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Prepare a spreadsheet that includes the following information:
Tab 1:
Title page with activity number and title, authors, and date completed
Tab 2:
Raw data for stopped and not-stopped vehicles
Tab 3:
Statistical summaries as required in Task 1
Tab 4:
Plot from Task 2
Tab 5:
Plot as required in Task 3
Tab 6:
Answers to the Critical Thinking Questions
As you begin this activity, consider the following questions. You will come back to these questions once
you have completed the activity.
1.
Based on the statistical summaries that you prepared in Task 1, how are the characteristics the same or
different for vehicles that stop in response to yellow and those that don’t?
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Drivers Responding to Yellow and Red Indications