Queue Jump - Detection Strategies and Timing

Detection Strategies and Timing

When an advance signal is used, it should be actuated by an approaching bus to avoid needlessly delaying other traffic when there is no bus present. If the queue jump lane is designated as bus-only, then standard traffic signal detection such as loop detectors or video detection can be used. If there is a limited amount of other traffic in the lane, then two or more loop detectors can be used and configured with AND logic such that only a long vehicle will actuate the advance phase. If the queue jump lane is shared with a higher volume of other traffic, a more high-tech detection scheme may be needed such as Opticom or RFID. Queue jump advance phases are typically 5-10 seconds in duration; longer time may be needed if multiple buses or right turning traffic need to be flushed through the queue jump in one signal cycle. Pedestrian phases can generally run concurrent with a queue jump phase as long as there are no protected turn phases also running with the queue jump phase.