What best describes a signal length?

A signal length is best described as a complete sequence of signal indications. This definition encompasses the entire set of signals emitted during a single complete cycle, which includes all phases such as green, yellow, and red lights as they transition. Understanding signal length in this way is crucial because it allows for a comprehensive view of how traffic and pedestrian signals operate within a given timeframe.

This approach helps traffic engineers and planners design signal phases that ensure efficient traffic flow while adhering to safety protocols for both vehicles and pedestrians. Being aware of the full sequence of indications is essential for optimizing traffic control systems and for ensuring that all users of the road are adequately informed about when to stop or proceed.

While other options mention aspects of signal operation, they focus on particular elements (like the duration of the green signal or pedestrian signal timing) rather than encapsulating the entirety of what a signal length involves. Thus, the choice correctly encapsulates the concept of a signal length as it pertains to the overall function and flow of traffic signals.