Josep Maria Salanova Grau | Centre for Research and Technology Hellas - Hellenic Institute of Transport (original) (raw)

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Papers by Josep Maria Salanova Grau

Procedia Computer Science, 2015

Taxi services account for a significant part of the daily trips in most of cities around the worl... more Taxi services account for a significant part of the daily trips in most of cities around the world. Due to the fact that most of the taxi markets are regulated by a central authority there is the need for developing tools for understanding the behavior of these markets to policy regulations and supporting decision makers. This paper presents an agent based model for simulating taxi services in urban areas. Taxi models presented in the literature can be grouped into aggregated, equilibrium and simulation models, with the latter having been studied to a lesser extent. Agent simulation is a powerful tool for analyzing such complex problems, where stochastic nature of the variables and spatial distribution hinders the application of aggregated models. The agent-based model is presented together with the behavioral rules of the agents and applied to the city of Barcelona, obtaining the optimum number of vehicles and performance indicators of the provision of taxi services under the dispatching operation mode.

Transportation Research Record: Journal of the Transportation Research Board, 2015

Transportation Planning and Technology, 2015

2014 International Conference on Connected Vehicles and Expo (ICCVE), 2014

ABSTRACT This paper provides an overview of the COMPASS4D project, which aims to deploy cooperati... more ABSTRACT This paper provides an overview of the COMPASS4D project, which aims to deploy cooperative mobility systems in seven European cities. More than 445 vehicles with 807 users and 147 intersections will be equipped. After an one-year full-scale pilot the aim of the pilot sites is to remain operational also after the end of the project. The cooperative services and the system architecture are described in detail, including all the main components. The evaluation framework is also presented.

INTERNATIONAL JOURNAL FOR TRAFFIC AND TRANSPORT ENGINEERING, 2015

This paper provides an overview of the COMPASS4D project, which aims to deploy cooperative mobili... more This paper provides an overview of the COMPASS4D project, which aims to deploy cooperative mobility systems in seven European cities. More than 445 vehicles with 807 users and 147 intersections will be equipped. After an one-year full-scale pilot the aim of the pilot sites is to remain operational also after the end of the project. The cooperative services and the system architecture are described in detail, including all the main components. The evaluation framework is also presented.

Transportation Research Part D: Transport and Environment, 2015

ABSTRACT The present paper presents a data-driven method for assessing the resilience of the Euro... more ABSTRACT The present paper presents a data-driven method for assessing the resilience of the European passenger transport network during extreme weather events. The method aims to fill in the gap of current research efforts regarding the quantification of impacts attributed to climate change and the identification of substitutability opportunities between transport modes in case of extreme weather events (EWE). The proposed method consists of three steps concerning the probability estimation of an EWE occurring within a transportation network, the assessment of its impacts and the passengers’ flow shift between various transport modes. A mathematical formulation for the proposed data-driven method is provided and applied in an indicative European small-scale network, in order to assess the impacts of EWE on modal choice. Results are expressed in passenger differentiated flows and the paper concludes with future research steps and directions.

Procedia - Social and Behavioral Sciences, 2014

Models are an indispensable tool for decision makers when defining the principal policy measures ... more Models are an indispensable tool for decision makers when defining the principal policy measures of the taxi services, such as fleet size, fares or operational modes of the services within the city. Various models have been developed for calculating the variables that characterize the taxi services in urban regions. This paper presents an extensive review of the presented formulations for the modeling of taxi services in urban areas. The variables of the problem are identified and analyzed, presenting the different formulations proposed in the literature for each one of the three operational modes (hailing, stand and dispatching).

International Journal of Urban Sciences, 2014

This paper proposes a location-based accessibility analysis framework to assess the suitability o... more This paper proposes a location-based accessibility analysis framework to assess the suitability of urban consolidation platform location scenarios. First, an overview of urban consolidation is presented to identify the main types of platforms and the related scientific work. Then, the proposed framework is presented on the form of a three-step procedure. The first step is to generate goods transport demand using a delivery-tocommodity model. The second consists in estimating routes both for serving the consolidation platforms supplied by shippers and for delivering customers afterwards, using a VRP algorithm. The third step consists in performing an accessibility calculation. Starting from the distances traveled obtained by the vehicle routing algorithm, travel times (including vehicle running and stopping times) are estimated, after which a location-based accessibility indicator based on transport cost is obtained.

Encyclopedia of Transportation: Social Science and Policy, 2014

Periodica Polytechnica Transportation Engineering, 2014

In recent years increasing attention has been paid to the development of various applications of ... more In recent years increasing attention has been paid to the development of various applications of Intelligent Transportation Systems, which are credited with the amelioration of traffic conditions in urban and regional environments. Real-time Traveler Information Services constitute an important element of Intelligent Transportation Systems by providing potential drivers with information on the network's current performance both en-route and pre-trip. In this way, traveler information services manage to facilitate drivers' travel choices and maximize the utilization of the available road capacity. In order to tackle the complexity of such systems, derived from the difficulty of providing real-time estimations of current as well as forecasts of future network conditions, a series of models and algorithms have been initiated. Dynamic Traffic Assignment models are believed to successfully capture the complexity of such tasks and are thus increasingly used in a series of such applications. This paper presents an Integrated Framework for real-time Traveler Information Services, focusing mainly on the implementation and use of an embedded large-scale Dynamic Traffic Assignment model, which operates within a series of other models and computational procedures and components in order to provide the necessary datasets. The Traveler Information Services using these datasets are provided by the Urban Mobility Management Centre of Thessaloniki, Greece, based on dynamically calculated traffic network conditions of the wider urban area. The underlying dynamic traffic model represents a large-scale road network, consisting of approximately 140.000 links and 40.000 nodes, which accounts for one of the largest road networks reported in the literature of dynamic or even static traffic assignment, at least to the authors' knowledge. The paper includes a discussion on development and implementation challenges as well as on the advantages and limitations of such an effort.