External adaptive control systems and methods

摘要

An external adaptive control system controls a traffic signal at a critical intersection that has a most conflicting volume of traffic among volumes of traffic at intersections in a traffic network. The external adaptive control system determines a plan identifying a guaranteed green light time and a minimum green duration and a period for the plan. The external adaptive control system determines, based on the plan, a non-linear schedule with one or more states corresponding to one or more individual phases with each state having a state start time and a state duration. Queues for individual traffic movements at the critical intersection also may be used to determine the non-linear schedule. The adaptive external control system controls the traffic signal according to the non-linear schedule. The external adaptive control system transmits its plan to one or more other external adaptive control systems for other intersections. The other external adaptive control systems determine other plans based on the plan from the external adaptive control system and an expected travel time between the critical intersection and the corresponding intersection.