Articles de revistahttp://hdl.handle.net/2117/1034792024-03-29T10:38:44Z2024-03-29T10:38:44ZBus network structure and mobility pattern: a monocentric analytical approach on a grid street layoutBadia Rodríguez, HugoEstrada Romeu, Miguel ÁngelRobusté Antón, Franceschttp://hdl.handle.net/2117/902972022-05-29T07:44:59Z2016-09-28T17:53:18ZBus network structure and mobility pattern: a monocentric analytical approach on a grid street layout
Badia Rodríguez, Hugo; Estrada Romeu, Miguel Ángel; Robusté Antón, Francesc
This study discusses which transit network structure is the best option to serve urban mobility. As a consequence of the evolution of urban form, cities have undergone a process of dispersion of their activities that has caused a change in mobility needs in the last few decades. Mobility networks and services should progressively adapt to the new demand patterns, especially the bus transit network, which has more flexibility to absorb the changes. We compare four base transit network structures: a radial scheme, a direct trip-based network, and a transfer-based system by means of either a complete grid or a hybrid structure. An analytical model is used to estimate the behavior of these structures for idealized monocentric mobility patterns with several degrees of concentration. The purpose is to determine the right range of situations for the applicability of each bus transit structure, and to determine guidelines about the transit network planning process. It turns out that the best structure is not always the same, and depends on the mobility spatial pattern. A radial network is the best alternative in very concentrated cities; however, a direct trip-based system is more suitable for intermediate degrees of dispersion. A transfer-based structure is the best option when the activities are more decentralized. Nevertheless, the decentralization degree that justifies a specific transit structure is not constant. This degree depends on the characteristics of the city, transport technology and users.
2016-09-28T17:53:18ZBadia Rodríguez, HugoEstrada Romeu, Miguel ÁngelRobusté Antón, FrancescThis study discusses which transit network structure is the best option to serve urban mobility. As a consequence of the evolution of urban form, cities have undergone a process of dispersion of their activities that has caused a change in mobility needs in the last few decades. Mobility networks and services should progressively adapt to the new demand patterns, especially the bus transit network, which has more flexibility to absorb the changes. We compare four base transit network structures: a radial scheme, a direct trip-based network, and a transfer-based system by means of either a complete grid or a hybrid structure. An analytical model is used to estimate the behavior of these structures for idealized monocentric mobility patterns with several degrees of concentration. The purpose is to determine the right range of situations for the applicability of each bus transit structure, and to determine guidelines about the transit network planning process. It turns out that the best structure is not always the same, and depends on the mobility spatial pattern. A radial network is the best alternative in very concentrated cities; however, a direct trip-based system is more suitable for intermediate degrees of dispersion. A transfer-based structure is the best option when the activities are more decentralized. Nevertheless, the decentralization degree that justifies a specific transit structure is not constant. This degree depends on the characteristics of the city, transport technology and users.Bus control strategies in corridors with signalized intersectionsEstrada Romeu, Miguel ÁngelMension, JosepAymamí, Josep MTorres, Laurahttp://hdl.handle.net/2117/901752020-07-23T20:07:17Z2016-09-23T15:44:30ZBus control strategies in corridors with signalized intersections
Estrada Romeu, Miguel Ángel; Mension, Josep; Aymamí, Josep M; Torres, Laura
This paper proposes a new dynamic bus control strategy aimed at reducing the negative effects of time-headway variations on route performance, based on real-time bus tracking data at stops. In routes with high demand, any delay of a single vehicle ends up causing an unstable motion of buses and producing the bus bunching phenomena. This strategy controls the cruising speed of buses and considers the extension of the green phase of traffic lights at intersections, when a bus is significantly delayed. The performance of this strategy will be compared to the current static operation technique based on the provision of slack times at holding points. An operational model is presented in order to estimate the effects of each controlling strategy, taking into account the vehicle capacity constraint. Control strategies are assessed in terms of passenger total travel time, operating cost as well as on the coefficient of headway variation. The effects of controlling strategies are tested in an idealized bus route under different operational settings and in the bus route of highest demand in Barcelona by simulation. The results show that the proposed dynamic controlling strategy reduces total system cost (user and agency) by 15–40% as well as the coefficient of headway variation 53–78% regarding the uncontrolled case, providing a bus performance similar to the expected when time disturbance is not presented.
2016-09-23T15:44:30ZEstrada Romeu, Miguel ÁngelMension, JosepAymamí, Josep MTorres, LauraThis paper proposes a new dynamic bus control strategy aimed at reducing the negative effects of time-headway variations on route performance, based on real-time bus tracking data at stops. In routes with high demand, any delay of a single vehicle ends up causing an unstable motion of buses and producing the bus bunching phenomena. This strategy controls the cruising speed of buses and considers the extension of the green phase of traffic lights at intersections, when a bus is significantly delayed. The performance of this strategy will be compared to the current static operation technique based on the provision of slack times at holding points. An operational model is presented in order to estimate the effects of each controlling strategy, taking into account the vehicle capacity constraint. Control strategies are assessed in terms of passenger total travel time, operating cost as well as on the coefficient of headway variation. The effects of controlling strategies are tested in an idealized bus route under different operational settings and in the bus route of highest demand in Barcelona by simulation. The results show that the proposed dynamic controlling strategy reduces total system cost (user and agency) by 15–40% as well as the coefficient of headway variation 53–78% regarding the uncontrolled case, providing a bus performance similar to the expected when time disturbance is not presented.Large-scale microscopic simulation of taxi services: Berlin and Barcelona case studiesMaciejewski, MichalSalanova Grau, Josep MariaBischoff, JoschkaEstrada Romeu, Miguel Ángelhttp://hdl.handle.net/2117/882832020-07-23T22:18:04Z2016-06-23T14:47:51ZLarge-scale microscopic simulation of taxi services: Berlin and Barcelona case studies
Maciejewski, Michal; Salanova Grau, Josep Maria; Bischoff, Joschka; Estrada Romeu, Miguel Ángel
The paper presents research on large-scale microscopic simulation of taxi services in Berlin and Barcelona based on floating car data collected by local taxi fleets. Firstly, Berlin's and Barcelona's taxi markets are shortly described and the demand and supply data obtained from FCD analysed. Secondly, the online taxi dispatching problem formulation for this specific case is given, followed by the definition of two real-time rule-based heuristics used to dispatch taxis dynamically within the simulation. Finally, the simulation setup in MATSim is described, and the results obtained with both heuristics are analysed and compared in terms of dispatching performance, proving the effectiveness of the second strategy at different demand and supply scales. This paper is an extended version of Maciejewski and Bischoff 2015, where only the Berlin case study was presented.
2016-06-23T14:47:51ZMaciejewski, MichalSalanova Grau, Josep MariaBischoff, JoschkaEstrada Romeu, Miguel ÁngelThe paper presents research on large-scale microscopic simulation of taxi services in Berlin and Barcelona based on floating car data collected by local taxi fleets. Firstly, Berlin's and Barcelona's taxi markets are shortly described and the demand and supply data obtained from FCD analysed. Secondly, the online taxi dispatching problem formulation for this specific case is given, followed by the definition of two real-time rule-based heuristics used to dispatch taxis dynamically within the simulation. Finally, the simulation setup in MATSim is described, and the results obtained with both heuristics are analysed and compared in terms of dispatching performance, proving the effectiveness of the second strategy at different demand and supply scales. This paper is an extended version of Maciejewski and Bischoff 2015, where only the Berlin case study was presented.Ocean–atmosphere–wave characterisation of a wind jet (Ebro shelf, NW Mediterranean Sea)Grifoll Colls, ManelNavarro, JorgePallarès López, ElenaRàfols Bundó, LauraEspino Infantes, ManuelPalomares, Anahttp://hdl.handle.net/2117/880402020-07-23T20:53:23Z2016-06-15T14:27:18ZOcean–atmosphere–wave characterisation of a wind jet (Ebro shelf, NW Mediterranean Sea)
Grifoll Colls, Manel; Navarro, Jorge; Pallarès López, Elena; Ràfols Bundó, Laura; Espino Infantes, Manuel; Palomares, Ana
In this contribution the wind jet dynamics in the northern margin of the Ebro River shelf (NW Mediterranean Sea) are investigated using coupled numerical models. The study area is characterised by persistent and energetic offshore winds during autumn and winter. During these seasons, a seaward wind jet usually develops in a ~50 km wide band offshore. The COAWST (Coupled Ocean–Atmosphere–Wave–Sediment Transport) modelling system was implemented in the region with a set of downscaling meshes to obtain high-resolution meteooceanographic outputs.Wind, waves and water currents were
compared with in situ observations and remote-sensingderived products with an acceptable level of agreement. Focused on an intense offshore wind event, the modelled wind jet appears in a limited area offshore with strong spatial variability. The wave pattern during the wind jet is characterised by the development of bimodal directional spectra, and the ocean circulation tends to present well-defined twolayer flow in the shallower region (i.e. inner shelf). The outer shelf tends to be dominated by mesoscale dynamics such
as the slope current. Due to the limited fetch length, ocean surface roughness considering sea state (wave–atmosphere coupling) modifies to a small extent the wind and significant wave height under severe cross-shelf wind events. However, the coupling effect in the wind resource assessment may be relevant due to the cubic relation between the wind intensity and power.
2016-06-15T14:27:18ZGrifoll Colls, ManelNavarro, JorgePallarès López, ElenaRàfols Bundó, LauraEspino Infantes, ManuelPalomares, AnaIn this contribution the wind jet dynamics in the northern margin of the Ebro River shelf (NW Mediterranean Sea) are investigated using coupled numerical models. The study area is characterised by persistent and energetic offshore winds during autumn and winter. During these seasons, a seaward wind jet usually develops in a ~50 km wide band offshore. The COAWST (Coupled Ocean–Atmosphere–Wave–Sediment Transport) modelling system was implemented in the region with a set of downscaling meshes to obtain high-resolution meteooceanographic outputs.Wind, waves and water currents were
compared with in situ observations and remote-sensingderived products with an acceptable level of agreement. Focused on an intense offshore wind event, the modelled wind jet appears in a limited area offshore with strong spatial variability. The wave pattern during the wind jet is characterised by the development of bimodal directional spectra, and the ocean circulation tends to present well-defined twolayer flow in the shallower region (i.e. inner shelf). The outer shelf tends to be dominated by mesoscale dynamics such
as the slope current. Due to the limited fetch length, ocean surface roughness considering sea state (wave–atmosphere coupling) modifies to a small extent the wind and significant wave height under severe cross-shelf wind events. However, the coupling effect in the wind resource assessment may be relevant due to the cubic relation between the wind intensity and power.Estimación del valor de la información del tiempo de viaje en autopistaSoriguera Martí, Franceschttp://hdl.handle.net/2117/879852020-07-23T20:45:29Z2016-06-14T13:49:14ZEstimación del valor de la información del tiempo de viaje en autopista
Soriguera Martí, Francesc
De un tiempo a esta parte, un objetivo común de muchos gestores de tráfico es proporcionar información del tiempo de viaje previsto en las infraestructuras que gestionan. Estos esfuerzos responden al hecho que el tiempo de viaje es la información de tráfico que más valora el usuario. No obstante, se desconoce como cuantificar el valor de esta información y como varía en función de la precisión proporcionada. Este conocimiento permitiría realizar análisis coste – beneficio que ayudarían a la toma de decisiones en relación a la tecnología a utilizar, la precisión necesaria, la selección de ámbitos rentables, y a analizar la disponibilidad al pago por esta información. El presente artículo pretende rellenar este vacío. Se propone una metodología probabilística basada en la teoría de la utilidad aleatoria que cuantifica el valor de la información del tiempo de viaje. Este valor es mayor cuanto mayor es la reducción de la incertidumbre que provoca y cuanto mayor es el coste de esta incertidumbre. En el artículo se presenta un ejemplo de aplicación para el acceso norte por autopista a la ciudad de Barcelona.
2016-06-14T13:49:14ZSoriguera Martí, FrancescDe un tiempo a esta parte, un objetivo común de muchos gestores de tráfico es proporcionar información del tiempo de viaje previsto en las infraestructuras que gestionan. Estos esfuerzos responden al hecho que el tiempo de viaje es la información de tráfico que más valora el usuario. No obstante, se desconoce como cuantificar el valor de esta información y como varía en función de la precisión proporcionada. Este conocimiento permitiría realizar análisis coste – beneficio que ayudarían a la toma de decisiones en relación a la tecnología a utilizar, la precisión necesaria, la selección de ámbitos rentables, y a analizar la disponibilidad al pago por esta información. El presente artículo pretende rellenar este vacío. Se propone una metodología probabilística basada en la teoría de la utilidad aleatoria que cuantifica el valor de la información del tiempo de viaje. Este valor es mayor cuanto mayor es la reducción de la incertidumbre que provoca y cuanto mayor es el coste de esta incertidumbre. En el artículo se presenta un ejemplo de aplicación para el acceso norte por autopista a la ciudad de Barcelona.La investigación y la formación en ingeniería del transporte en EspañaRobusté Antón, Franceschttp://hdl.handle.net/2117/869242020-07-23T21:16:29Z2016-05-11T10:40:05ZLa investigación y la formación en ingeniería del transporte en España
Robusté Antón, Francesc
Este artículo plasma una “foto” de la docencia e investigación científica actual sobre ingeniería del transporte en España. Tanto la formación a nivel universitario como la investigación en transporte han alcanzado estándares internacionales durante los últimos decenios.; This paper takes a “picture” of the curricula and scientific research on transportation engineering in Spain. Both university training and research on transportation have reached international standards during the last decades.
2016-05-11T10:40:05ZRobusté Antón, FrancescEste artículo plasma una “foto” de la docencia e investigación científica actual sobre ingeniería del transporte en España. Tanto la formación a nivel universitario como la investigación en transporte han alcanzado estándares internacionales durante los últimos decenios.
This paper takes a “picture” of the curricula and scientific research on transportation engineering in Spain. Both university training and research on transportation have reached international standards during the last decades.Las Redes de plataformas logísticas intermodales como elementos para la mejora del transporte integral de mercancíasCampos Cacheda, Jose Maginhttp://hdl.handle.net/2117/868272020-07-23T21:16:51Z2016-05-10T09:26:26ZLas Redes de plataformas logísticas intermodales como elementos para la mejora del transporte integral de mercancías
Campos Cacheda, Jose Magin
2016-05-10T09:26:26ZCampos Cacheda, Jose MaginAgent based modeling for simulation of taxi servicesSalanova Grau, Josep MariaEstrada Romeu, Miguel ÁngelMitsakis, EvangelosStamos, Iraklishttp://hdl.handle.net/2117/827282020-07-23T21:53:14Z2016-02-09T14:09:02ZAgent based modeling for simulation of taxi services
Salanova Grau, Josep Maria; Estrada Romeu, Miguel Ángel; Mitsakis, Evangelos; Stamos, Iraklis
This paper presents an agent based model for simulating taxi services in urban areas. The three operation modes (hailing, stand and dispatching) are modeled and tested in the Sioux Falls network. Taxi models presented in the literature are divided into aggregated and equilibrium models, with a very small presence of simulation models.
The different programmed modules are presented together with the behavior rules of the agents. Performance indicators are calculated for each operation mode and compared in terms of driver earnings, user cost and vacant versus occupied time.
2016-02-09T14:09:02ZSalanova Grau, Josep MariaEstrada Romeu, Miguel ÁngelMitsakis, EvangelosStamos, IraklisThis paper presents an agent based model for simulating taxi services in urban areas. The three operation modes (hailing, stand and dispatching) are modeled and tested in the Sioux Falls network. Taxi models presented in the literature are divided into aggregated and equilibrium models, with a very small presence of simulation models.
The different programmed modules are presented together with the behavior rules of the agents. Performance indicators are calculated for each operation mode and compared in terms of driver earnings, user cost and vacant versus occupied time.Nuevos datos de tráfico en autopista con límites de velocidad variableSoriguera Martí, FrancescSala Sanmartí, MarcelMartínez Josemaria, Irenehttp://hdl.handle.net/2117/818412023-09-10T13:31:23Z2016-01-21T19:31:20ZNuevos datos de tráfico en autopista con límites de velocidad variable
Soriguera Martí, Francesc; Sala Sanmartí, Marcel; Martínez Josemaria, Irene
Este artículo presenta el experimento con Límites de Velocidad Variable (DSL) que se realizó en Junio de 2013 en la autopista B-23 de acceso a Barcelona. El sistema DSL instalado en esta autopista, así como la alta densidad de equipamiento de monitorización disponible, hicieron de este un tramo adecuado para establecer un higway lab, un laboratorio de tráfico a escala real. El objetivo de este experimento es construir una completa base de datos de tráfico bajo distintos límites de velocidad, que permita avanzar en el conocimiento de esta estrategia de gestión activa del tráfico. Se tomaron medidas detalladas del contaje de vehículos, velocidad, ocupación, cambios de carril y tiempos de viaje. Todas las mediciones, provenientes de distintos equipos, han sido agrupadas en una única base de datos, disponible para la comunidad científica. El artículo describe el experimento y presenta algunos resultados preliminares.
2016-01-21T19:31:20ZSoriguera Martí, FrancescSala Sanmartí, MarcelMartínez Josemaria, IreneEste artículo presenta el experimento con Límites de Velocidad Variable (DSL) que se realizó en Junio de 2013 en la autopista B-23 de acceso a Barcelona. El sistema DSL instalado en esta autopista, así como la alta densidad de equipamiento de monitorización disponible, hicieron de este un tramo adecuado para establecer un higway lab, un laboratorio de tráfico a escala real. El objetivo de este experimento es construir una completa base de datos de tráfico bajo distintos límites de velocidad, que permita avanzar en el conocimiento de esta estrategia de gestión activa del tráfico. Se tomaron medidas detalladas del contaje de vehículos, velocidad, ocupación, cambios de carril y tiempos de viaje. Todas las mediciones, provenientes de distintos equipos, han sido agrupadas en una única base de datos, disponible para la comunidad científica. El artículo describe el experimento y presenta algunos resultados preliminares.Parking slot assignment for urban distribution: models and formulationsRoca Riu, MireiaFernández Aréizaga, ElenaEstrada Romeu, Miguel Ángelhttp://hdl.handle.net/2117/788862020-07-23T23:02:07Z2015-11-06T11:48:44ZParking slot assignment for urban distribution: models and formulations
Roca Riu, Mireia; Fernández Aréizaga, Elena; Estrada Romeu, Miguel Ángel
A key element to enhance urban distribution is the adequate management of parking space, particularly for loading and unloading operations. An in-advance booking system able to be adjusted to users needs can be a very useful tool for city councils. Such a tool should be fed with criteria for allocating requests to time slots. In this paper we discuss alternative criteria for the parking slot assignment problem for urban distribution and we propose the use of mathematical programming formulations to model them. Several models are proposed, analyzed and compared among them. Extensive computational experience is presented with a detailed analysis and comparison, which provides quantitative indicators of the quality of each of the proposed models.
2015-11-06T11:48:44ZRoca Riu, MireiaFernández Aréizaga, ElenaEstrada Romeu, Miguel ÁngelA key element to enhance urban distribution is the adequate management of parking space, particularly for loading and unloading operations. An in-advance booking system able to be adjusted to users needs can be a very useful tool for city councils. Such a tool should be fed with criteria for allocating requests to time slots. In this paper we discuss alternative criteria for the parking slot assignment problem for urban distribution and we propose the use of mathematical programming formulations to model them. Several models are proposed, analyzed and compared among them. Extensive computational experience is presented with a detailed analysis and comparison, which provides quantitative indicators of the quality of each of the proposed models.