In traffic signal operations, what does the term "cycle length" refer to?

Cycle length in traffic signal operations refers to the total time required for a complete sequence of signal phases, including all green, yellow, and red phases for all approaches at an intersection. This definition encompasses the entire operational cycle that regulates the flow of traffic through the intersection, allowing for various movements to occur in a controlled manner.

Understanding the cycle length is essential for optimizing traffic flow, reducing delays, and improving overall intersection efficiency. It helps traffic engineers determine how long vehicles will wait, how many vehicles can pass through the intersection during a green phase, and how to coordinate signals for smooth progression along corridors.

Other options do not accurately capture the comprehensive nature of what cycle length means in the context of traffic signals. For instance, while the duration of a single green light is an important part of a cycle, it does not represent the entire cycle as it excludes the yellow and red phases. Additionally, the time interval between traffic counts and the period of peak traffic flow do not pertain to the functioning of traffic signals directly.