What purpose does the all-red clearance interval serve before a new green phase?

The all-red clearance interval is a critical component in traffic signal operations, serving to clear the intersection. This specific phase provides a brief period during which all traffic signals display red, ensuring that vehicles in the intersection can safely clear the area before the new green phase begins.

This is particularly important for preventing collisions, as it allows drivers who may not have completely exited the intersection when the light changed to have a final moment to do so without the risk of new conflicting traffic entering the intersection simultaneously. The all-red interval also helps in accommodating any pedestrians who may still be crossing and ensures that the area is safe for all road users before transitioning into the new green phase.

While there are other important aspects related to traffic signal control, such as signaling for pedestrian crossings or resetting signal phases, the primary function of the all-red clearance interval is to clear the intersection, enhancing overall safety and efficiency in traffic operations.