Name an important factor to consider when planning signal timing.

Traffic volume and peak hours are essential factors to consider when planning signal timing because they directly influence the flow of vehicles and pedestrians at an intersection. Understanding the volume of traffic allows signal technicians to design a timing plan that accommodates the highest levels of congestion effectively. During peak hours, traffic tends to increase significantly, which necessitates optimizing signal timings to reduce delays and improve safety.

By analyzing traffic volume data, engineers can determine how long signals should remain green for different movements, when to allow for left turns, and when to implement pedestrian phases. This data-driven approach helps in minimizing stop-and-go conditions, thereby enhancing overall traffic efficiency and safety for all road users.

In contrast, while pedestrian crossings, vehicle types, and weather conditions are all relevant considerations, they are secondary to the primary influence of traffic volume, which dictates the flow dynamics at intersections.