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Chapter 4: Actuated Traffic Controller Timing Processes
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The purpose of this activity is to give you the opportunity to observe the timing of a traffic phase and the
method by which the phase terminates.
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Describe the two primary methods for the termination of a traffic phase at an isolated intersection
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Movie file: A20.wmv
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Prepare a document that includes answers to eachCritical ThinkingQuestion based on your observations
from this activity
1.
Why does the phase terminate for each of the two cases that you observe?
2. What is the process followed by the minimum green timer from the beginning of the green indication,
until the timer expires?
3. What is the process followed by the vehicle extension timer from the beginning of the green indication,
until the timer expires?
4. What is the process followed by the maximum green timer from the beginning of the green indication,
until the timer expires?
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How a Traffic Phase Times and Terminates