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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 give you the opportunity to determine the vehicle change and clearance
intervals for your design.
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Determine the vehicle change and clearance intervals
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Describe how the variability of vehicle approach speeds affects the determination of the vehicle change
and clearance intervals
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VISSIM input file from Activity #50
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Prepare a report using an Excel spreadsheet that includes your simulation data, your analysis, and your
answers to the Critical Thinking Questions.
Tab 1:
Title page with activity number and title, authors, and date completed
Tab 2:
Data from FZP file
Tab 3:
Parsed data for selected approach
Tab 4:
Chart showing speed vs. distance upstream from the stop bar
Tab 5:
Calculations for the yellow and red clearance times
Tab 6:
Table of measures of effectiveness for each approach and for the intersection
Tab 7:
Answers to Critical Thinking Questions
1. What effect did the range in speeds that you observed for vehicles approaching the intersection have
on the final result of the values of the yellow and red clearance times? Discuss your answer.
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Determining Vehicle Change and Clearance Intervals