In traffic signal operation, what term comprises the green interval plus the change and clearance intervals?

• A. Phase
• B. Actuated Signal
• C. Greenshield's Model
• D. Weaving Sections

Answer: (A)

The term described is phase. In traffic signal timing, a phase is the portion of the cycle during which a specific movement has the right-of-way. The green interval starts the phase, the change interval (yellow) signals the transition, and the clearance interval (red) clears the intersection before the phase ends. Together, green plus change plus clearance define one phase of that movement.

Other terms don’t fit this description: an actuated signal refers to how the signal is controlled (sensor-based timing), Greenshield's model is a traffic-flow theory, and weaving sections are parts of freeway design, not intervals within a signal phase.