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Chapter 8: Left Turn Phasing—Permitted, Protected, or Both
267
The purpose of this activity is to give you the opportunity to increase your understanding of permitted left
turn phasing.
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Determine the efficiency of permitted left turn operations under various opposing through traffic
volumes
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Movie file: A47.wmv
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Prepare a document that includes your answers to the Critical Thinking Questions
As you begin this activity, consider the following questions. You will come back to these questions at the
end of the activity.
1.
How does the opposing volume affect the quality of the left turn permitted operation for each of the
two cases?
2. What change to the phasing plan would you consider, if any, to improve the quality of the operation
for case 2?
3. Do the two cases that you observed conform to the queuing model diagrams described in the reading
(Activity #45)? Explain your answer.
47
Permitted Left Turn Operations