What is traffic signal timing?

Answer: C — The process of determining the durations of traffic signal phases to optimize traffic flow

Traffic signal timing refers specifically to the process of determining the durations of various traffic signal phases—such as green, yellow, and red lights—to achieve optimal traffic flow at intersections. This timing is critical for managing vehicle and pedestrian movement, reducing delays, improving safety, and enhancing overall intersection efficiency. By carefully calculating and adjusting the lengths of each phase, traffic engineers can minimize congestion, reduce waiting times, and promote smooth transitions through the intersection. For example, longer green lights may be assigned to busier streets during peak hours, while pedestrian crossing intervals may be carefully timed to ensure safety. The other options, while related to traffic management, do not encapsulate the core definition of traffic signal timing. Synchronizing traffic cameras involves monitoring traffic but does not dictate how signals operate. Planning road construction phases addresses the logistics of construction work rather than signal operation. Collecting traffic survey data is important for informing traffic management decisions but does not directly deal with the timing of signals themselves. Therefore, the focus on optimizing signal phases clearly aligns with the definition provided in the correct choice.