What does a pre-timed traffic signal rely on for operation?

A pre-timed traffic signal relies on fixed time intervals for its operation. This type of signal is programmed to change at predetermined intervals regardless of the actual traffic conditions at that time. This approach is useful in scenarios where traffic patterns are relatively consistent and predictable, allowing for an efficient flow of vehicles without the need for immediate adjustments. By using fixed time intervals, these signals can manage the timing of red and green lights based on historical traffic data rather than real-time data or sensor inputs, providing a simple, reliable method of traffic control in stable environments.