6.8.1 Traffic Detection During a Signal Cycle
Traffic can be detected at any time during the signal cycle. In this respect, there are two considerations:
- Initial detection: Arriving traffic (vehicle or pedestrian) faced by a red signal registers an initial demand (via a detection system) that it requires a green signal.
- Subsequent detection: Vehicle traffic approaching on a green signal registers (via the same detection system) that it requires the green signal to continue.
The type and location of detection systems used determine the parameters of the initial and subsequent detections, and as a consequence the design and operation of traffic responsive signal control are determined.