Which component of a signal cycle describes the moment when a movement is allowed to move?

• A. Yellow
• B. All-red
• C. Pedestrian clearance
• D. Green time

Answer: (D)

Green time is the portion of a signal cycle when a specific movement has the right-of-way and may proceed. It starts when the signal turns green for that movement and lasts until the signal changes to yellow (or red). The moment a vehicle or pedestrian is allowed to move corresponds to the start of this green interval, and the length of that permission is the green time. The other phases serve different purposes: yellow is a warning before stopping, all-red clearance provides a safety buffer between conflicting movements, red requires a stop, and pedestrian clearance is the time allocated for pedestrians to cross.