Each vehicular phase is usually comprised of three specific intervals. Which of the following is not one of those intervals?

A vehicular phase in traffic signal operation typically consists of three specific intervals: the green interval, the yellow change interval, and the red clearance interval. The green interval allows vehicles to proceed safely through the intersection, providing the right of way for moving traffic. Once the green interval ends, the yellow change interval signals drivers to prepare to stop, indicating that the light is about to turn red. This is crucial for ensuring that vehicles can clear the intersection safely before the signal changes. Finally, the red clearance interval offers an additional moment for vehicles to clear the intersection after the light has turned red, enhancing safety by allowing time for any lingering vehicles to exit the intersection.

In contrast, the pedestrian wait interval is not classified as part of the vehicular phase intervals. Instead, it pertains to pedestrian signal phases where pedestrians are instructed to wait before crossing the street. While this is an important aspect of traffic signal management, it does not form part of the intervals that make up a vehicular phase. Understanding these distinctions helps clarify the specific roles each aspect of traffic signal timing plays in ensuring safe and efficient traffic flow.