Papers by cristina vilarinho
Traffic in a city is very much affected by traffic lights. They are not the only pieces in this p... more Traffic in a city is very much affected by traffic lights. They are not the only pieces in this puzzle, but they are important elements of traffic management. Traffic lights have the power to improve the safety at intersections, which are considered critical elements of the network, avoiding traffic conflicts between the different vehicle and pedestrian movements by managing time in space. In order to avoid the dangerous conflicts and to optimize the control, people have to wait for the green light, spending valuable time and building up frustration, while vehicles keep consuming fuel and producing hazardous emissions. In this research a novel traffic signal control is developed. Instead of using the traditional vehicle-based optimization perspective, in which the approach is to look at the vehicle traffic condition as dependent on standard metrics such as vehicle flow and vehicle delay, a novel person-based strategy is instead adopted. It seems to be an interesting possibility to look into the traffic conditions distinguishing vehicles with different occupancy, allowing a control based on people present/expected at the intersection. viii In the proposed traffic control strategy, average delay time is reduced on the arm with the highest value, distributing and balancing the delay among all intersection arms. As a consequence, the arms with low average delay tend to increase. The benefit for the network will be bigger when the most delayed arms have a high relative demand.
IEEE Intelligent Systems, 2016
This article describes the various steps to analyze and design a multiagent system for real-time ... more This article describes the various steps to analyze and design a multiagent system for real-time traffic control at isolated intersections. The control strategies for traffic signals are important because they impact the economy, environment, and society and also affect freight transport, which many researchers have studied over the years. The research community has focused on the optimization of traffic signal plans. Although these efforts have been relatively successful, the strategies lack flexibility, which limits their effectiveness. In addition to defining the best traffic plan at the design phase, researchers must aim to maintain the system optimized during the operation phase. In this way, the research target is to develop an approach for controlling traffic signals that relies on flexibility and maximum freedom in control, in which the system is updated frequently to meet traffic demand, taking into account different traffic users. This study's main outcome is a conceptual model of a novel perspective of a multiagent system for real-time traffic control at isolated intersections. This model, which was based on the Gaia methodology, introduces a new perspective in which each isolated intersection is itself a multiagent system. The many agents designed for isolated intersections create, manage, and evolve their own traffic signal plans. Therefore, this proposed multiagent control brings the benefit of staged designs and sequences being formed as needed instead of being established a priori.
The main objective of the CIVITAS initiative is to support cities to introduce ambitious transpor... more The main objective of the CIVITAS initiative is to support cities to introduce ambitious transport measures and policies towards sustainable urban mobility, achieving a significant shift in the modal split towards sustainable transport. In this context it is crucial to have a good understanding of the transport term “modal split”, which is an important indicator of the efficiency of the implemented strategies. This paper discusses and compares different methodologies used for collection of modal split data.
fe.up.pt
... Mapa do Campus. Final Evaluation Plan - ELAN Deliverable No. 12.1. Relatório - Outros. Autore... more ... Mapa do Campus. Final Evaluation Plan - ELAN Deliverable No. 12.1. Relatório - Outros. Autores: Dirk Engels Branko Kontić Marko Matulin tefica Mrvelj Begga Van Cauwenberge Cristina Vilarinho José Pedro Tavares. Área: 2 Engenharia e tecnologia > 2.1 Engenharia civil. ...
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Papers by cristina vilarinho