Timing submission of transit signal priority requests to reduce transit vehicle stop times
First Claim
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1. A method of submitting transit signal priority (TSP) requests, comprising:
- receiving TSP information of a vehicle by a phase selector at a current time;
determining from the TSP information, an estimated time of arrival (ETA) of the vehicle at an intersection having a traffic signal controlled by an intersection controller;
determining a phase of the traffic signal at the ETA, wherein the phase at the ETA is an arrival phase;
determining a phase-relative arrival time of the ETA in the arrival phase;
determining a time to issue the TSP request based on the phase-relative arrival time and one of a non-green truncation threshold and a green extension threshold relative to the arrival phase; and
issuing the TSP request by the phase selector to the intersection controller at the determined time.
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Abstract
Approaches are disclosed for timing the submission of transit signal priority (TSP) requests. A phase selector receives TSP information of a vehicle at a current time, and the phase selector determines an estimated time of arrival (ETA) of the vehicle at an intersection having a traffic signal controlled by an intersection controller. The phase selector determines the arrival phase of the traffic signal at the ETA, along with a phase-relative arrival time of the ETA. The phase selector determines a time to issue the TSP request based on the phase-relative arrival time, and issues the TSP request to the intersection controller at the determined time.
28 Citations
30 Claims
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1. A method of submitting transit signal priority (TSP) requests, comprising:
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receiving TSP information of a vehicle by a phase selector at a current time; determining from the TSP information, an estimated time of arrival (ETA) of the vehicle at an intersection having a traffic signal controlled by an intersection controller; determining a phase of the traffic signal at the ETA, wherein the phase at the ETA is an arrival phase; determining a phase-relative arrival time of the ETA in the arrival phase; determining a time to issue the TSP request based on the phase-relative arrival time and one of a non-green truncation threshold and a green extension threshold relative to the arrival phase; and issuing the TSP request by the phase selector to the intersection controller at the determined time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A traffic signal control system, comprising:
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a phase selector configured and arranged to; receive TSP information of a vehicle at a current time; determine from the TSP information, an estimated time of arrival (ETA) of the vehicle at an intersection having the traffic signal; determine a phase of the traffic signal at the ETA, wherein the phase at the ETA is an arrival phase; determine a phase-relative arrival time of the ETA in the arrival phase; determine a time to issue a TSP request based on the phase-relative arrival time and one of a non-green truncation threshold and a green extension threshold relative to the arrival phase; and output the TSP request at the determined time; and an intersection controller coupled to the phase selector and to the traffic signal, the intersection controller configured and arranged to adjust a phase of the traffic signal in response to the TSP request. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification