19.4Signal Control

Automatic signaling systems respond to real-time changes in traffic volumes to offer priority to BRT vehicles and reduce intersection delay for all users. Techniques for signal management for bus priority include: single-phase and cycle adjustments, bus-only turns, and bus-only phases. For the management of priority for buses at traffic signals, it is necessary to balance the objective of improving the public transport performances against the impacts of doing so in mixed traffic. In some cases, bus frequencies may be so high that signal priority would result in continuous green lights, and therefore is not practical. Coordination between the BRT agency and other entities responsible for traffic management is necessary to arrive at a common set of criteria for managing signaling systems.

Fig. 19.9 Signal control system.