Control of traffic signal phases
First Claim
1. A method for controlling a traffic signal phase at one or more intersections, respectively, comprising:
- configuring a control system at an intersection to operate in one of a first mode or a second mode;
wherein the configuring of the control system to operate in the second mode includes storing data indicative of an evacuation direction;
while operating the control system in the first mode, in response to a transit priority signal received by the control system from a vehicle assigned transit priority, extending a green phase of the traffic signal in favor of the vehicle assigned transit priority; and
while operating the control system in the second mode, in response to a transit priority signal received by the control system from the vehicle assigned transit priority, preempting a current non-green phase of the traffic signal to a green phase in favor of the vehicle assigned transit priority;
wherein the preempting of the current non-green phase of the traffic signal is denied to the vehicle assigned transit priority unless the vehicle assigned transit priority is traveling in the evacuation direction.
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Accused Products
Abstract
Controlling a traffic signal phase at one or more intersections. A control system at an intersection is configured to operate in one of a first mode or a second mode. While operating the controller in the first mode, in response to a transit priority signal received by the control system from a vehicle assigned transit priority, a green phase of the traffic signal is extended in favor of the vehicle assigned transit priority. While operating the control system in the second mode, in response to a transit priority signal received by the control system from the vehicle assigned transit priority, a current non-green phase of the traffic signal is preempted to a green phase in favor of the vehicle assigned transit priority.
54 Citations
21 Claims
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1. A method for controlling a traffic signal phase at one or more intersections, respectively, comprising:
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configuring a control system at an intersection to operate in one of a first mode or a second mode; wherein the configuring of the control system to operate in the second mode includes storing data indicative of an evacuation direction; while operating the control system in the first mode, in response to a transit priority signal received by the control system from a vehicle assigned transit priority, extending a green phase of the traffic signal in favor of the vehicle assigned transit priority; and while operating the control system in the second mode, in response to a transit priority signal received by the control system from the vehicle assigned transit priority, preempting a current non-green phase of the traffic signal to a green phase in favor of the vehicle assigned transit priority; wherein the preempting of the current non-green phase of the traffic signal is denied to the vehicle assigned transit priority unless the vehicle assigned transit priority is traveling in the evacuation direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 19)
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12. A system for controlling a traffic signal phase at an intersection, comprising:
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a control system at an intersection configurable to operate in one of a first mode or a second mode; wherein the control system is configurable to store data indicative of an evacuation direction; two or more traffic signals coupled to the control system; wherein the control system is configured to; extend, in response to a transit priority signal received from a vehicle assigned transit priority while the control system is operating in the first mode, a green phase of one of the two or more traffic signals in favor of the vehicle assigned transit priority; and preempt, in response to a transit priority signal received by the control system from the vehicle assigned transit priority while the control system is operating the control system in the second mode, a current non-green phase of the one of the two or more traffic signals to a green phase in favor of the vehicle assigned transit priority; wherein the control system is further configured to deny the preempting of the current non-green phase of the one of the two or more traffic signals to the vehicle assigned transit priority unless the vehicle assigned transit priority is traveling in the evacuation direction. - View Dependent Claims (13, 14, 15, 16, 17, 20)
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18. A system for controlling traffic signal phases of a plurality of respective sets of two or more traffic signals at a plurality of intersections, comprising:
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a management system; a plurality of control systems at the plurality of intersections, respectively, each control system coupled to the management system and individually configurable via the management system to operate in one of a first mode or a second mode; wherein each control system is coupled to one of the respective sets of two or more traffic signals, each control system is configurable to store data indicative of an evacuation direction, and each control system is configured to; extend, in response to a transit priority signal received from a vehicle assigned transit priority while the control system is operating in the first mode, a green phase of one traffic signal of the respective set of two or more traffic signals in favor of the vehicle assigned transit priority; and preempt, in response to a transit priority signal received by the control system from the vehicle assigned transit priority while the control system is operating in the second mode, a current non-green phase of the one traffic signal of the respective set of two or more traffic signals to a green phase in favor of the vehicle assigned transit priority, deny the preempting of the current non-green phase of the one of the two or more traffic signals to the vehicle assigned transit priority unless the vehicle assigned transit priority is traveling in the evacuation direction. - View Dependent Claims (21)
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Specification