Practice question

What is a Purdue Coordination Diagram (PCD) used for?

To diagram the physical layout of signal cabinets at Purdue University
To visualize the relationship between vehicle arrivals and signal phase changes to evaluate coordination quality
To diagram the coordination between Purdue transit buses and traffic signals
To show the wiring diagram for a coordinated signal system

Answer: B — To visualize the relationship between vehicle arrivals and signal phase changes to evaluate coordination quality

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