What is the yield point in the context of coordinated traffic signals?

The yield point in the context of coordinated traffic signals refers to the point at which traffic on a major street has priority, affecting how signals are coordinated to ensure smooth traffic flow. This concept is particularly relevant when managing traffic at intersections where increases in vehicle volume might require adjustments to signal timing to optimize throughput.

When a signal reaches the yield point, it indicates that the current phase for a major street should be coming to an end, allowing for the transition to the next phase, which could benefit cross-traffic or pedestrian movement. By understanding the yield point's significance, traffic engineers can better design signal plans that enhance safety and improve traffic operations during peak times.

The other choices do not encapsulate the concept of the yield point. The start of a pedestrian phase, for example, relates to pedestrian signal timings, which can be influenced by the yield point but do not define it. The duration of a red light and the moment a signal cycles are related to signal operation but do not convey the idea of prioritization in traffic flow that the yield point represents.