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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 show you some of the issues that must be considered when setting the
yellow and red clearance intervals.
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Describe the process for setting the yellow and red clearance intervals
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Define the terms and variables in the Glossary
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Prepare a document that includes answers to the Critical Thinking Questions
Provide a definition for each of the following terms or variables. Paraphrasing a formal definition (as
provided by your text, instructor, or another resource) demonstrates that you understand the meaning of
the term or phrase.
change interval
clearance
interval
perception-
reaction time
stopping
distance
x
s
v
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The Theoretical Basis of the Yellow and Red
Clearance Intervals