Optimal mainstream traffic flow control of large-scale motorway networks

Carlson, Rodrigo Castelan; Papamichail, Ioannis; Papageorgiou, Markos; Meßmer, Albert

doi:10.1016/j.trc.2009.05.014

Cited by 223 publications

(136 citation statements)

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“…> q q (otherwise MTFC would not intervene), but the congestion outflow in the MTFC case is higher than in the no-control case, because the capacity drop is avoided; hence the controlled congestion is space-time shorter than in the no-control case (and thus the BOR effect is accordingly reduced). Further details on the benefits of MTFC can be found in Carlson et al (2010aCarlson et al ( , 2010bCarlson et al ( , 2011a. In this paper, variable speed limits (VSLs) are used as an MTFC actuator to impose the controlled flow c q on the freeway mainstream.…”

Section: The Mtfc Conceptmentioning

confidence: 99%

“…In this paper, variable speed limits (VSLs) are used as an MTFC actuator to impose the controlled flow c q on the freeway mainstream. The use of VSLs requires consideration of several implementation issues that were detailed by Carlson et al (2010aCarlson et al ( , 2011a.…”

Section: The Mtfc Conceptmentioning

confidence: 99%

“…In contrast to Carlson et al (2010a), only one cluster of links, L101-L102, is considered in this investigation, i.e., VSLs are applied locally in the area near the bottleneck location, similarly to what is done with local feedback in the next section. The resulting TTS value for this scenario is equal to 8,675 veh·h, which is a 38.8 percent improvement compared to the no-control case.…”

Section: Nonlinear Optimal Control (Amoc)mentioning

confidence: 99%

“…A recent concept for freeway traffic flow control is Main- stream Traffic Flow Control (MTFC) as introduced by Carlson et al (2010aCarlson et al ( , 2010b) using a nonlinear optimal control method. MTFC aims at directly influencing the freeway mainstream flow via an appropriate actuator, such as variable speed limits (VSLs), and may complement existing traffic control measures.…”

Section: Introductionmentioning

confidence: 99%

“…In an attempt to circumvent the practical limitations of some of the previous methods, Carlson et al (2011a) proposed, based on the same MTFC application concept of Carlson et al (2010aCarlson et al ( , 2010b, a simple, yet efficient VSLbased MTFC feedback cascade controller that is deemed suitable for ready field implementation. This paper demonstrates the use of the two controllers developed by Carlson Mainstream traffic flow control on freeways using variable speed limits et al (2010a, 2010b, 2011a) for the MTFC on freeways via VSLs.…”

Section: Introductionmentioning

confidence: 99%

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Mainstream Traffic Flow Control on Freeways Using Variable Speed Limits

2013

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Mainstream Traffic Flow Control (MTFC), enabled via variable speed limits, is a control concept for real-time freeway traffic management. The benefits of MTFC for efficient freeway traffic flow have been demonstrated recently using an optimal control approach and a feedback control approach. In this paper, both control approaches are reviewed and applied to a freeway network in a simulation environment. The validated network model used reflects an actual freeway (a ring-road), fed with actual (measured) demands. The optimal and feedback control results are discussed, compared and demonstrated to improve significantly the system performance. In particular, the feedback control scheme is deemed suitable for immediate practical application as it takes into account operational requirements and constraints, while its results are shown to be satisfactory. In addition, the control system performance was not very sensitive to variations of the parameters of the feedback controller. This result indicates that the burden associated with fine tuning of the controller may be reduced in the field. DOI:10.4237/transportes.v21i3.694.Keywords: freeway traffic control, mainstream traffic flow control, variable speed limits, feedback control, optimal control.Resumo: Controle do Fluxo Principal (CFP), realizado via limites de velocidade variáveis, é um conceito de controle para o gerenciamento em tempo real do tráfego em rodovias. Os benefícios de CFP para a fluidez do tráfego foram demonstrados por pesquisas recentes que utilizaram uma abordagem de controle ótimo e uma abordagem de controle realimentado. Neste artigo, as duas abordagens de controle são revisadas e aplicadas a uma malha rodoviária em um ambiente de simulação. O modelo utilizado da malha rodoviária, que reproduz um anel viário real, foi validado e alimentado com demandas medidas em campo. Os resultados de controle ótimo e controle realimentado são discutidos e comparados, e produzem melhora significativa no desempenho do sistema. A estrutura de controle realimentado é considerada apropriada para a aplicação em campo, uma vez que considera requisitos e restrições operacionais, e apresenta resultados satisfatórios. Além disso, o desempenho do sistema de controle mostrou pouca sensibilidade a variações nos parâme-tros do controlador realimentado. Este resultado indica que os esforços para sintonia do controlador em campo podem ser reduzidos.Palavras-chave: controle de tráfego rodoviário, controle do fluxo principal, limites de velocidade variáveis, controle realimentado, controle ótimo.

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Section: The Mtfc Conceptmentioning

confidence: 99%

Section: The Mtfc Conceptmentioning

confidence: 99%

Section: Nonlinear Optimal Control (Amoc)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%