Which interval begins with the yellow phase and indicates impending red?

Which interval begins with the yellow phase and indicates impending red?

• A. Red Clearance Interval
• B. All-Red
• C. Yellow Clearance Interval
• D. Green Interval

Answer: (C)

Understanding how signal timing marks the transition from yellow to red helps you recognize which interval begins with yellow and signals that red is coming. The Yellow Clearance Interval starts when the yellow phase appears and indicates that the red phase is imminent. Its purpose is to give drivers a final warning and a window to clear the intersection before opposing traffic gets a red signal, enhancing safety during the transition. In contrast, a Red Clearance Interval occurs after red is already showing, allowing vehicles to clear the intersection; an All-Red interval is a separate all-directions red period, not tied to the yellow phase; and the Green Interval is the go phase, not the transition toward red.

Understanding how signal timing marks the transition from yellow to red helps you recognize which interval begins with yellow and signals that red is coming. The Yellow Clearance Interval starts when the yellow phase appears and indicates that the red phase is imminent. Its purpose is to give drivers a final warning and a window to clear the intersection before opposing traffic gets a red signal, enhancing safety during the transition.

In contrast, a Red Clearance Interval occurs after red is already showing, allowing vehicles to clear the intersection; an All-Red interval is a separate all-directions red period, not tied to the yellow phase; and the Green Interval is the go phase, not the transition toward red.