Browsing by Author "Papamichail, Ioannis"

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  • Evaluation of a model predictive control framework for motorway traffic involving conventional and automated vehicles
    (2018-07-01) Perraki, Georgia; Roncoli, Claudio; Papamichail, Ioannis; Papageorgiou, Markos
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    A Model Predictive Control (MPC) strategy for motorway traffic management, which takes into account both conventional control measures and control actions executed by vehicles equipped with Vehicle Automation and Communication Systems (VACS), is presented and evaluated using microscopic traffic simulation. A stretch of the motorway A20, which connects Rotterdam to Gouda in the Netherlands, is taken as a realistic test bed. In order to ensure the reliability of the application results, extensive speed and flow measurements, collected from the field, are used to calibrate the site's microscopic traffic simulation model. The efficiency of the MPC framework, applied to this real sizable and complex network under realistic traffic conditions, is examined for different traffic conditions and different penetration rates of equipped vehicles. The adequacy of the control application when only VACS equipped vehicles are used as actuators, is also considered, and the related findings underline the significance of conventional control measures during a transition period or in case of increased future demand.
  • Highway traffic state estimation with mixed connected and conventional vehicles: Microscopic simulation-based testing
    (2017-05-01) Fountoulakis, Markos; Bekiaris-Liberis, Nikolaos; Roncoli, Claudio; Papamichail, Ioannis; Papageorgiou, Markos
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
  • Integrated motorway traffic flow control
    (2017) Papamichail, Ioannis; Iordanidou, Georgia-Roumpini; Roncoli, Claudio; Papageorgiou, Markos
     A4 Artikkeli konferenssijulkaisussa
    The development and deployment of simple, yet efficient, coordinated and integrated control tools for motorway traffic control remains a challenge. A generic integrated feedback-based motorway traffic flow control concept has been proposed recently by the authors of this paper. It is based on the combination and suitable extension of control algorithms and tools proposed or deployed in other studies, such as ramp metering or VSL (Variable Speed Limit)-enabled cascade-feedback mainstream traffic flow control, and allows for consideration of multiple bottlenecks. The new controller enables coordination of ramp metering actions at a series of on-ramps, as well as integration with VSL control actions towards a common control goal, which is bottleneck throughput maximization. While doing this, the approach considers a pre-specified (desired) balancing of the incurred delays upstream of the employed actuators, via a suitably designed knapsack problem. Despite the multitude of the offered configurations, options and possibilities, the generic control algorithm remains simple, efficient and suitable for field implementation. The control algorithm is demonstrated and evaluated using validated macroscopic traffic flow models for two case studies and for a number of different scenarios.