What are the three types of recall features in a traffic signal controller?

The three types of recall features in a traffic signal controller refer to how the signal responds to different conditions and traffic demands. The correct answer includes minimum, maximum, and pedestrian recalls, each serving a specific function in optimizing traffic flow and safety.

Minimum recall is designed to ensure that a signal has a minimum green time. This is particularly important for maintaining a baseline level of service at intersections, allowing traffic to flow even when there is low volume.

Maximum recall, on the other hand, sets an upper limit on green time, essential for preventing excessive delays for cross traffic and managing the traffic cycle effectively.

Pedestrian recall is tailored specifically for pedestrian movements, ensuring that pedestrians have a guaranteed time to cross the street, which contributes to their safety and enhances walkability in urban areas.

Understanding these recall features is crucial for traffic signal technicians, as they need to manage and configure signals to meet varied traffic conditions and ensure safe and efficient operation.