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Conference Paper: Group-based hierarchical adaptive traffic-signal control for isolated junctions
Title | Group-based hierarchical adaptive traffic-signal control for isolated junctions |
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Authors | |
Issue Date | 2018 |
Publisher | The Transportation Research Board (TRB). |
Citation | The Transportation Research Board (TRB) 97th Annual Meeting, Washington D.C., 7-11 January 2018 How to Cite? |
Abstract | A group-based adaptive traffic-control method for isolated signalized junctions is developed that includes a hierarchical structure comprising tactical and local levels of signal timing optimization. The control method optimizes the signal timings in adaptive traffic-control systems, and takes full advantage of flexible new technologies to incorporate the most up-to-date traffic information, as collected in real time. A multi-resolution strategy is proposed for updating the elements of the signal plans cycle-by-cycle and adjusting the current green signal timing second-by-second. The definitions, combinations, and sequencing of the cycle structure stages are generated automatically using a procedure for optimizing the signal-timing plans in response to online data from traffic detectors. There is a high degree of flexibility in the tactical identification of the optimal signal plan in response to the real-time predicted traffic information, the objective function of the polygonal delay formula, and the direct differential equations for the adaptive group-based variables. The reactive local signal-control policy, which is formed based on the max-pressure strategy, is developed to locally adjust the current green signal time and to accommodate delicate demand fluctuations second-by-second at the fine-resolution level. The results of the computer simulations presented in this study show that the integrated group-based adaptive traffic-signal-control logic outperforms the other methods over a wide range of traffic conditions, from free-flowing traffic to extreme congestion. Moreover, the proposed models perform much better than the existing fixed-signal plan and the actuated signal-control in asymmetric traffic conditions. |
Persistent Identifier | http://hdl.handle.net/10722/251371 |
DC Field | Value | Language |
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dc.contributor.author | Lee, S | - |
dc.contributor.author | Wong, SC | - |
dc.contributor.author | Varaiya, P | - |
dc.date.accessioned | 2018-02-28T06:18:38Z | - |
dc.date.available | 2018-02-28T06:18:38Z | - |
dc.date.issued | 2018 | - |
dc.identifier.citation | The Transportation Research Board (TRB) 97th Annual Meeting, Washington D.C., 7-11 January 2018 | - |
dc.identifier.uri | http://hdl.handle.net/10722/251371 | - |
dc.description.abstract | A group-based adaptive traffic-control method for isolated signalized junctions is developed that includes a hierarchical structure comprising tactical and local levels of signal timing optimization. The control method optimizes the signal timings in adaptive traffic-control systems, and takes full advantage of flexible new technologies to incorporate the most up-to-date traffic information, as collected in real time. A multi-resolution strategy is proposed for updating the elements of the signal plans cycle-by-cycle and adjusting the current green signal timing second-by-second. The definitions, combinations, and sequencing of the cycle structure stages are generated automatically using a procedure for optimizing the signal-timing plans in response to online data from traffic detectors. There is a high degree of flexibility in the tactical identification of the optimal signal plan in response to the real-time predicted traffic information, the objective function of the polygonal delay formula, and the direct differential equations for the adaptive group-based variables. The reactive local signal-control policy, which is formed based on the max-pressure strategy, is developed to locally adjust the current green signal time and to accommodate delicate demand fluctuations second-by-second at the fine-resolution level. The results of the computer simulations presented in this study show that the integrated group-based adaptive traffic-signal-control logic outperforms the other methods over a wide range of traffic conditions, from free-flowing traffic to extreme congestion. Moreover, the proposed models perform much better than the existing fixed-signal plan and the actuated signal-control in asymmetric traffic conditions. | - |
dc.language | eng | - |
dc.publisher | The Transportation Research Board (TRB). | - |
dc.relation.ispartof | The Transportation Research Board (TRB) Annual Meeting | - |
dc.title | Group-based hierarchical adaptive traffic-signal control for isolated junctions | - |
dc.type | Conference_Paper | - |
dc.identifier.email | Wong, SC: hhecwsc@hku.hk | - |
dc.identifier.authority | Wong, SC=rp00191 | - |
dc.identifier.hkuros | 284313 | - |
dc.publisher.place | Washington D.C. | - |