What is included in the phase layout diagram of a traffic signal plan?

The phase layout diagram of a traffic signal plan primarily includes the configuration of traffic signals for all phases of operation. This is critical as it visually represents how the traffic signals will be arranged and how they will operate during different phases of the signal cycle. It outlines the specific sequences for vehicles and can indicate how long each light will be activated for various directions of traffic. Understanding this configuration helps engineers and city planners ensure efficient traffic flow, enhance safety, and manage the interactions between different lanes and signals effectively.

The other options, while they may be relevant to traffic signal operations in general, do not specifically pertain to the phase layout diagram. Instructions for pedestrians may be included in broader traffic management plans but are not part of the phase configuration. Maintenance schedules are essential for the upkeep of traffic signals but do not fit within the phase layout's visual representation. Signal timing adjustments are important for optimizing traffic flow but are typically detailed outside the layout diagram itself, focusing more on operational timings than on the physical configuration of the signals.